https://scholar.google.com/citations?user=8RfIQ9cAAAAJ&hl=en&oi=ao check this scholar account. He has a bunch of remarkable publications from the requested area
see my literature sources. They may be able to help you.
Best regards
Anatol Badach
Lanxiang Chen, Wai-Kong Lee, Chin-Chen Chang, Kim-Kwang Raymond Choo, Nan Zhang: Blockchain based searchable encryption for electronic health record sharing; Future Generation Computer Systems, Jan 2019,
Tomilayo Fatokun, Avishek Nag, Sachin Sharma: Towards a Blockchain Assisted Patient Owned System for Electronic Health Records; Journals Electronics, Vol. 10, Issue 5, Mar 2021, DOI: 10.3390/electronics10050580
https://www.mdpi.com/2079-9292/10/5/580/htm
Medicalchain, 2017. Medicalchain – A blockchain for electronic health records. https://medicalchain.com/Medicalchain-Whitepaper-EN.pdf