How is the salary of professors and researchers in medicine? For university-level researchers and professors, is the salary higher in the medical fields than in other fields? I suppose attracting physicians to teach may be harder, because they can usually get high payments working as physicians. Where can I find data about this in Europe, Australia, Canada and US?
For the US, I would have thought the data would be in the AAUP report, but I cannot find any data that breaks salaries down by field.

There is also CUPA-HR. The free data set has a break down by field with "HEALTH PROFESSIONS AND RELATED PROGRAMS" as a field. I would assume that this includes medical doctors, but also nurses. There is also some free data about non-tenure track salaries including "Medicine, Medical Clinical Sciences, Graduate Medical Studies". 

In summary, I think defining the "medicine area" and equating job duties and responsibilities is tough. There appears to be a large variation in salaries.