title: Circadian rhythms of cortisol: effects of surgical operation.
mesh_terms: D000328:Adult; D002940:Circadian Rhythm; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D008297:Male; D008875:Middle Aged; D013514:Surgical Procedures, Operative
chemical_list: D006854:Hydrocortisone