How much does it hurt? The pervasive problem of pain.
D001291:Attitude of Health Personnel; D006801:Humans; D010146:Pain / Q000453:epidemiology* / Q000517:prevention & control*; D010818:Practice Patterns, Physicians' / Q000592:standards; D011787:Quality of Health Care; D012307:Risk Factors; D014481:United States / Q000453:epidemiology