A machine learning and blockchain based secure and cost-effective framework for minor medical consultations[J] SUSTAINABLE COMPUTING-INFORMATICS & SYSTEMS 2022(35) Hassija, Vikas Ratnakumar, Rahul Chamola, Vinay Agarwal, Soumya Mehra, Aryan Kanhere, Salil S. Huynh Thi Thanh Binh