Why physician's sample? Else they are trade promotional material!
Agarwal
R K
RK
D000329:Advertising; D004345:Drug Industry; D011307:Drug Prescriptions / Q000191:economics*; D004992:Ethics, Medical; D006801:Humans; D004364:Pharmaceutical Preparations / Q000191:economics; D010820:Physicians
D004364:Pharmaceutical Preparations