Update health_data.md

Added information about TEHDAS and HealthData@EU

pages/your_domain/health_data.md

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   * Researchers, innovators and policymakers can request access to these electronic health data in a trusted and secure way that preserves the individual’s personal data
 The EHDS will also regulate the interoperability of EHRs to a certain extent, in particular to facilitate the exchange of the patient summary data.
 
+EHDS places a significant emphasis on promoting the secondary use of health data, to serve research, innovation, policy making and regulatory purposes. To achieve this, several European initiatives have been launched to establish its foundation and define guiding principles. Among these endeavors, two signification projects stand out:
+- [TEHDAS]( https://tehdas.eu/), the joint action Towards the European Health Data Space, helped develop and promote concepts for the secondary use of health data to benefit public health and health research and innovation in Europe. TEHDAS produced [a set of recommendations]( https://tehdas.eu/results/) for the European Commission and member states to enable secondary use of health data.
+- [HealthData@EU Pilot](https://ehds2pilot.eu/) is a project designed to build a pilot version of the EHDS infrastructure for the secondary use of health data “HealthData@EU”. The project establishes connections between data platforms within a network infrastructure and develops services that facilitate the user journey for research projects using health data. It also offers guidelines for data standards, data quality, data security and data transfer to support this cross-border infrastructure.
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 The EU published an overview of the [national laws on electronic health records](https://health.ec.europa.eu/other-pages/basic-page/overview-national-laws-electronic-health-records-eu-member-states-2016_en) in 2016. Under US law, EHR data is classified as protected health information (PHI) and must comply with security laws and encrypt data properly when sending or retrieving such information. Examples of protected health data include patient names, phone numbers, addresses, dates of birth, social security numbers, and insurance information.
   * Regulations: [Health Insurance Portability and Accountability Act (HIPAA) and Health Information Technology for Economic and Clinical Health (HITECH)](https://www.hhs.gov/hipaa/for-professionals/security/laws-regulations/index.html)