Davidson's principles and practice of medicine.   Principles and practice of medicine    - 23rd edition /  edited by Stuart H. Ralston, Ian D. Penman, Mark W.J. Strachan, Richard P. Hobson ; illustrations by Robert Britton.   - Edinburgh :  Elsevier,  2018.   - xx, 1417 pages :  illustrations (black and white, and colour) ;  27 cm