There is a paper that looked at Providers' knowledge of PrEP and compared it to whether they had prescribed PrEP:
Knowledge is Power! Increased Provider Knowledge Scores Regarding Pre-exposure Prophylaxis (PrEP) are Associated with Higher Rates of PrEP Prescription and Future Intent to Prescribe PrEP.
Blumenthal J, Jain S, Krakower D, Sun X, Young J, Mayer K, Haubrich R; CCTG 598 Team.
AIDS Behav. 2015 May;19(5):802-10. doi: 10.1007/s10461-015-0996-z.