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medicine cardiology recent guidelines bone disorder arthritis mineralocorticoids endocrinology adrenal cortex hiv retroviral disease fluid therapy fluid management iv polyarteritis nodosa hypertension aha doppler basic echo echocardiography echo kawasaki disease temporal arteritis vasculitis syndrome autoimmune disorders fracture orthopaedics osteoporosis approach to thyroid thyroid disordr thyroid occupational lung disorder lung disorder lung arrhythmias heart ecg takayasu aortitis apprach wegeners granulomatosis