Major Challenges and Future Approaches in the Employment of Blockchain and Machine Learning Techniques in the Health and Medicine[J] SECURITY AND COMMUNICATION NETWORKS 2022(2022) UmaMaheswaran, S. K. Prasad, G. Lakshmi Vara Omarov, Batyrkhan Abdul-Zahra, Dalael Saad Vashistha, Piyush Pant, Bhasker Kaliyaperumal, Karthikeyan