- NLM Classification (1006)
- QT Physiology (19)
- QU Biochemistry (31)
- QZ Pathology (229)
- W Health professions (228)
- WA Public health (158)
- WB Practice of medicine (380)
- WG Cardiovascular system (102)
- WI Digestive system (80)
- WJ Urogenital system (51)
- WK Endocrine system (24)
- WL Nervous system (38)
- WM Psychiatry (27)
- WO Surgery (143)
- WP Gynaecology (79)
- WQ Obstetrics (19)
- WR Dermatology (13)
- WS Pediatrics (38)
- WV Otolaryngology (13)
- WW Ophthalmology (16)
- WY Nursing (2)
- Y Other (119)
Number of items at this level: 0.