Physician response rates to a telephone survey: effects of monetary incentive level.
D001291:Attitude of Health Personnel; D002487:Centers for Disease Control and Prevention, U.S.; D006801:Humans; D007252:Influenza Vaccines / Q000627:therapeutic use; D007407:Interviews as Topic / Q000191:economics*; D009042:Motivation; D010820:Physicians; D014481:United States