# WIA-AGING Phase 4: Integration Specification

> **Version:** 1.0.0
> **Status:** Official
> **Last Updated:** 2025-01-01
> **Philosophy:** 弘益人間 (Benefit All Humanity)

---

## 1. Overview

The WIA-AGING Integration specification defines patterns and requirements for integrating the WIA-AGING standard into existing healthcare ecosystems, research platforms, wearable devices, and enterprise systems. This phase ensures seamless interoperability while maintaining security and compliance.

### 1.1 Integration Goals

- **Healthcare Interoperability:** Connect with EHR, LIS, and pharmacy systems
- **Wearable Ecosystem:** Support major wearable platforms
- **Research Platforms:** Enable data sharing for longevity research
- **Enterprise Systems:** Scale for organizational deployments

---

## 2. Integration Architecture

### 2.1 Hub-and-Spoke Model

```
                    ┌─────────────────┐
                    │   WIA-AGING     │
                    │      Hub        │
                    └────────┬────────┘
                             │
         ┌───────────────────┼───────────────────┐
         │                   │                   │
    ┌────┴────┐        ┌────┴────┐        ┌────┴────┐
    │   EHR   │        │ Wearable │        │ Research │
    │ Adapter │        │ Adapter  │        │ Adapter  │
    └────┬────┘        └────┬────┘        └────┬────┘
         │                   │                   │
    ┌────┴────┐        ┌────┴────┐        ┌────┴────┐
    │  Epic   │        │  Apple  │        │ Longevity│
    │  Cerner │        │  Oura   │        │ Database │
    │  etc.   │        │  etc.   │        │          │
    └─────────┘        └─────────┘        └─────────┘
```

### 2.2 Federated Model

For privacy-sensitive deployments, the federated model keeps data at the source:

```
┌──────────────┐    ┌──────────────┐    ┌──────────────┐
│ Institution A│    │ Institution B│    │ Institution C│
│  ┌────────┐  │    │  ┌────────┐  │    │  ┌────────┐  │
│  │WIA Node│  │    │  │WIA Node│  │    │  │WIA Node│  │
│  └───┬────┘  │    │  └───┬────┘  │    │  └───┬────┘  │
└──────┼───────┘    └──────┼───────┘    └──────┼───────┘
       │                   │                   │
       └───────────────────┼───────────────────┘
                           │
                    ┌──────┴──────┐
                    │ Coordination │
                    │    Layer     │
                    └─────────────┘
```

---

## 3. Healthcare System Integration

### 3.1 HL7 FHIR Mapping

| WIA-AGING Resource | FHIR Resource | Notes |
|--------------------|---------------|-------|
| AgingProfile | Patient + Observation | Patient demographics + biomarkers |
| BiologicalAge | Observation | Custom code system |
| Biomarker | Observation | Map to LOINC codes |
| Assessment | DiagnosticReport | Summary of assessment |
| Intervention | CarePlan / Procedure | Longevity interventions |

### 3.2 FHIR Resource Example

```json
{
  "resourceType": "Observation",
  "id": "biological-age-001",
  "meta": {
    "profile": ["https://wia.org/fhir/StructureDefinition/BiologicalAge"]
  },
  "status": "final",
  "category": [{
    "coding": [{
      "system": "http://terminology.hl7.org/CodeSystem/observation-category",
      "code": "vital-signs"
    }]
  }],
  "code": {
    "coding": [{
      "system": "https://wia.org/aging/codes",
      "code": "WIA-BIO-AGE",
      "display": "Biological Age"
    }]
  },
  "subject": {
    "reference": "Patient/123"
  },
  "effectiveDateTime": "2025-01-15T09:00:00Z",
  "valueQuantity": {
    "value": 48.3,
    "unit": "years",
    "system": "http://unitsofmeasure.org",
    "code": "a"
  },
  "component": [
    {
      "code": {
        "coding": [{
          "system": "https://wia.org/aging/codes",
          "code": "WIA-AGE-DIFF",
          "display": "Age Difference"
        }]
      },
      "valueQuantity": {
        "value": -6.7,
        "unit": "years"
      }
    },
    {
      "code": {
        "coding": [{
          "system": "https://wia.org/aging/codes",
          "code": "WIA-AGE-RATE",
          "display": "Aging Rate"
        }]
      },
      "valueQuantity": {
        "value": 0.88,
        "unit": "ratio"
      }
    }
  ]
}
```

### 3.3 EHR Integration Checklist

| Requirement | Description | Priority |
|-------------|-------------|----------|
| FHIR R4 Support | Minimum FHIR version | Required |
| SMART on FHIR | OAuth 2.0 authorization | Required |
| Bulk Data | FHIR Bulk Data Access | Recommended |
| Subscriptions | Real-time notifications | Optional |
| CDS Hooks | Clinical decision support | Optional |

---

## 4. Wearable Device Integration

### 4.1 Supported Platforms

| Platform | Integration Method | Data Types |
|----------|-------------------|------------|
| Apple HealthKit | Native SDK | Heart rate, HRV, steps, sleep |
| Google Fit | REST API | Activity, vitals, nutrition |
| Samsung Health | Native SDK | Heart rate, stress, oxygen |
| Oura Ring | REST API | Sleep, readiness, activity |
| Whoop | REST API | Strain, recovery, sleep |
| Garmin Connect | REST API | Activity, sleep, stress |
| Fitbit | REST API | Activity, heart rate, sleep |

### 4.2 Apple HealthKit Integration

```swift
import HealthKit

class WIAAgingHealthKitBridge {
    let healthStore = HKHealthStore()

    func requestAuthorization() {
        let readTypes: Set<HKSampleType> = [
            HKQuantityType(.heartRate),
            HKQuantityType(.heartRateVariabilitySDNN),
            HKQuantityType(.stepCount),
            HKCategoryType(.sleepAnalysis),
            HKQuantityType(.oxygenSaturation)
        ]

        healthStore.requestAuthorization(
            toShare: nil,
            read: readTypes
        ) { success, error in
            if success {
                self.startBackgroundDelivery()
            }
        }
    }

    func syncToWIAAging(samples: [HKSample]) async {
        let biomarkers = samples.map { sample in
            WIABiomarker(
                code: mapToWIACode(sample.sampleType),
                value: extractValue(sample),
                unit: mapToWIAUnit(sample.sampleType),
                timestamp: sample.startDate
            )
        }

        try await WIAAgingClient.shared.submitBiomarkers(biomarkers)
    }
}
```

### 4.3 Data Mapping

| Wearable Metric | WIA-AGING Code | Unit | Frequency |
|-----------------|----------------|------|-----------|
| Heart Rate | WIA-AGE-HR | bpm | 1/minute |
| HRV (SDNN) | WIA-AGE-HRV | ms | 1/hour |
| Resting HR | WIA-AGE-RHR | bpm | 1/day |
| Steps | WIA-AGE-STEPS | count | 1/hour |
| Sleep Duration | WIA-AGE-SLEEP | hours | 1/day |
| Deep Sleep | WIA-AGE-DEEP-SLEEP | hours | 1/day |
| SpO2 | WIA-AGE-SPO2 | % | 1/hour |

---

## 5. Legacy System Bridge

### 5.1 Adapter Pattern

```
┌─────────────────────────────────────────────────┐
│                 Legacy System                    │
│  ┌──────────┐  ┌──────────┐  ┌──────────┐       │
│  │ HL7 v2.x │  │ CSV/Excel│  │ Custom DB │       │
│  └────┬─────┘  └────┬─────┘  └────┬─────┘       │
└───────┼─────────────┼─────────────┼─────────────┘
        │             │             │
        ▼             ▼             ▼
┌───────────────────────────────────────────────┐
│              WIA-AGING Adapter                 │
│  ┌─────────┐  ┌─────────┐  ┌─────────┐        │
│  │ Parser  │  │Transformer│ │ Validator│        │
│  └────┬────┘  └────┬────┘  └────┬────┘        │
│       └────────────┼────────────┘              │
│                    ▼                           │
│            ┌─────────────┐                     │
│            │ WIA-AGING   │                     │
│            │   Format    │                     │
│            └─────────────┘                     │
└───────────────────────────────────────────────┘
```

### 5.2 Data Transformation Rules

```yaml
transformations:
  - source: "legacy_crp"
    target: "WIA-AGE-001"
    mapping:
      field: "value"
      convert: "mg/dL to mg/L"
      factor: 10
    validation:
      min: 0
      max: 100

  - source: "legacy_glucose"
    target: "WIA-AGE-005"
    mapping:
      field: "fasting_glucose"
      unit: "mg/dL"
    validation:
      min: 20
      max: 600
```

---

## 6. Cloud Deployment

### 6.1 Deployment Models

| Model | Description | Use Case |
|-------|-------------|----------|
| SaaS | WIA-managed cloud | Small organizations |
| Private Cloud | Customer's cloud (AWS/GCP/Azure) | Enterprise |
| On-Premise | Customer's data center | Regulated industries |
| Hybrid | Combination | Complex requirements |

### 6.2 Kubernetes Deployment

```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: wia-aging-api
  labels:
    app: wia-aging
spec:
  replicas: 3
  selector:
    matchLabels:
      app: wia-aging-api
  template:
    metadata:
      labels:
        app: wia-aging-api
    spec:
      containers:
      - name: api
        image: wia/aging-api:1.0.0
        ports:
        - containerPort: 8080
        env:
        - name: DATABASE_URL
          valueFrom:
            secretKeyRef:
              name: wia-aging-secrets
              key: database-url
        resources:
          requests:
            memory: "256Mi"
            cpu: "250m"
          limits:
            memory: "512Mi"
            cpu: "500m"
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 10
```

### 6.3 Infrastructure Requirements

| Component | Minimum | Recommended |
|-----------|---------|-------------|
| API Servers | 2 | 3+ |
| Database | 100 GB SSD | 500 GB+ SSD |
| Memory per node | 4 GB | 8 GB |
| CPU per node | 2 cores | 4 cores |
| Network | 1 Gbps | 10 Gbps |

---

## 7. Monitoring & Observability

### 7.1 Metrics

| Metric | Type | Description |
|--------|------|-------------|
| `wia_aging_requests_total` | Counter | Total API requests |
| `wia_aging_request_duration_seconds` | Histogram | Request latency |
| `wia_aging_assessments_total` | Counter | Assessments performed |
| `wia_aging_biomarkers_ingested` | Counter | Biomarkers received |
| `wia_aging_active_connections` | Gauge | WebSocket connections |
| `wia_aging_error_rate` | Gauge | Error percentage |

### 7.2 Alerting Rules

```yaml
groups:
- name: wia-aging-alerts
  rules:
  - alert: HighErrorRate
    expr: wia_aging_error_rate > 0.05
    for: 5m
    labels:
      severity: critical
    annotations:
      summary: "High error rate detected"

  - alert: HighLatency
    expr: histogram_quantile(0.95, wia_aging_request_duration_seconds) > 2
    for: 5m
    labels:
      severity: warning
    annotations:
      summary: "API latency exceeds 2 seconds (p95)"
```

### 7.3 Logging Standards

```json
{
  "timestamp": "2025-01-15T10:30:00.000Z",
  "level": "INFO",
  "service": "wia-aging-api",
  "trace_id": "abc123xyz",
  "span_id": "def456",
  "message": "Assessment completed",
  "context": {
    "profile_id": "profile_abc123",
    "biological_age": 48.3,
    "duration_ms": 145
  }
}
```

---

## 8. Compliance & Certification

### 8.1 Regulatory Compliance

| Regulation | Region | Requirements |
|------------|--------|--------------|
| HIPAA | USA | PHI protection, BAAs |
| GDPR | EU | Data subject rights, DPIAs |
| PIPEDA | Canada | Consent, data minimization |
| PIPA | South Korea | Cross-border transfers |
| PDPA | Singapore | DPO appointment |

### 8.2 Security Certifications

| Certification | Description |
|---------------|-------------|
| SOC 2 Type II | Security, availability, processing integrity |
| ISO 27001 | Information security management |
| HITRUST | Healthcare information trust |
| FedRAMP | US federal cloud security |

### 8.3 WIA Certification Levels

| Level | Requirements | Benefits |
|-------|--------------|----------|
| Bronze | Phase 1 compliance | Listed in WIA registry |
| Silver | Phase 1-2 compliance | Use WIA logo |
| Gold | Phase 1-3 compliance | Priority support |
| Platinum | Phase 1-4 compliance + audit | Enterprise features |

---

## 9. Migration Guide

### 9.1 Migration Steps

1. **Assessment:** Inventory existing systems and data
2. **Mapping:** Map legacy data to WIA-AGING format
3. **Pilot:** Deploy in test environment
4. **Validation:** Verify data integrity
5. **Migration:** Execute data migration
6. **Cutover:** Switch to production
7. **Monitoring:** Track for issues

### 9.2 Rollback Strategy

```yaml
rollback:
  triggers:
    - error_rate > 5%
    - latency_p95 > 5s
    - data_integrity_check_failed
  procedure:
    - pause_ingestion
    - switch_traffic_to_legacy
    - restore_from_snapshot
    - notify_stakeholders
```

---

**弘益人間 (홍익인간) - Benefit All Humanity**

*WIA - World Certification Industry Association*
*© 2025 MIT License*