1. ONC: Office of the National Coordinator for Health Information Technology2018-12-18What is a patient portal?
https://www.healthit.gov/faq/what-patient-portal
2. ONC: Office of the National Coordinator for Health Information Technology2018-12-18Are there difference types of personal health records (PHRs)?
https://www.healthit.gov/faq/are-there-different-types-personal-health-records-phrs
3. Patient web portals, disease management, and primary prevention
4. Personal Health Record Use in the United States: Forecasting Future Adoption Levels