HIPAA-Compliant Patient Data Anonymization API Endpoint

Design a Flask-based RESTful API endpoint that automatically anonymizes patient health records using advanced data masking techniques. Implement robust encryption for sensitive fields like SSN, name, and contact information while preserving statistical integrity for research purposes. Use cryptographic libraries to ensure HIPAA compliance, and create middleware that validates data transformation before storage. Include comprehensive error handling for different anonymization scenarios and generate detailed audit logs for each data transformation process.