Physicians' perceptions about unnecessary diagnostic testing.
D001291:Attitude of Health Personnel; D003697:Delphi Technique; D003955:Diagnostic Tests, Routine / Q000191:economics*; D006296:Health Services; D006300:Health Services Misuse; D006801:Humans; D007388:Internal Medicine; D007396:Internship and Residency; D008505:Medical Staff, Hospital; D010414:Pennsylvania; D010820:Physicians