People who have done interesting and important work in the AI for healthcare/biomedicine space. Also people who have done work relevant to AI in healthcare/biomedicine (such as fairness work).
All the anaesthesia and pain medicine people and organisations you need to follow!
Medical Informatics people and organizations
Just more medical journals ("Medical Journals" is now full - check it out)
Second group of health and medical informaticians advancing improved health outcomes and health system innovation