title: Normal serum calcium levels in air force flying personnel.
mesh_terms: D000293:Adolescent; D000328:Adult; D000337:Aerospace Medicine; D002118:Calcium / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013054:Spectrophotometry, Atomic; D014481:United States
chemical_list: D002118:Calcium