Hubungan neuropati otonom dengan disfungsi ereksi pada diabetes melitus tipe 2 : kajian skor survey autonomic symptoms dan heart rate variability di RSUPN dr. Cipto Mangunkusumo = Association of diabetic autonomic neuropathy with erectile dysfunction in type 2 diabetic patients : a study survey of autonomic symptoms score and heart rate variability in Dr. Cipto Mangunkusumo, The National Referral Hospital