http://emedicine.medscape.com/article/243492-overview#showall
This open-access article is content-rich (long) but rather theoretical rather than practical, yet glosses over uncertainties around pathogenesis etc.í Doesn’t really fill the bill fully as either a clinical introduction or as a theoretical learning resource, but there is a lot there, and it’s free. The articles in Medscape‘s Reference section, which you can access […]