title: I can not understand!
authors: Sidney
authors: S
authors: Glina
mesh_terms: D055088:Early Detection of Cancer / Q000191:economics; D006801:Humans; D008297:Male; D017410:Practice Guidelines as Topic / Q000592:standards*; D017430:Prostate-Specific Antigen / Q000592:standards*; D011471:Prostatic Neoplasms / Q000175:diagnosis*; D014481:United States
chemical_list: D017430:Prostate-Specific Antigen