Patient attendance at hospital clinics.
D000328:Adult; D001071:Appointments and Schedules; D001900:Boston; D005500:Follow-Up Studies; D006330:Heart Defects, Congenital / Q000628:therapy; D006745:Hospital Bed Capacity, 300 to 499; D006801:Humans; D010044:Outpatient Clinics, Hospital / Q000458:organization & administration*; D010349:Patient Compliance; D012214:Rheumatic Heart Disease / Q000628:therapy; D012306:Risk