The physician's use of the hospital.
D000328:Adult; D000367:Age Factors; D000368:Aged; D003625:Data Collection; D005260:Female; D006761:Hospitals / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D008504:Medical Staff Privileges; D008505:Medical Staff, Hospital; D008875:Middle Aged; D010821:Physicians, Family; D012737:Sex Factors; D013044:Specialty Boards; D013223:Statistics as Topic; D014481:United States