Public Health and Mental Health: RA
Internal Medicine: RC
Pharmacology: RM
When looking for general descriptions of health topics, including disorders, procedures, specialty fields, etc., books are a good place to start. Printed books, in many cases, are not as current as studies published in more recent professional journals, but journal articles tend to be more narrowly focused on a particular aspect of a topic.
If TCC does not own a book you can request to have it sent to you through interlibrary loan OR you can check to see whether a local academic or public library has the article in WorldCat.