Current status of manpower in cardiology.
D000328:Adult; D000367:Age Factors; D000368:Aged; D002309:Cardiology; D002568:Certification; D005843:Geography; D006280:Health Workforce; D006801:Humans; D008875:Middle Aged; D010820:Physicians / Q000600:supply & distribution; D011156:Population Density; D011364:Professional Practice; D012017:Referral and Consultation; D012424:Rural Population; D013038:Specialization; D014481:United States; D014505:Urban Population