This simple reference book should answer most of your questions about the risks of surgery and is written in understandable language.
Simon Marinker graduated in January 1936 from the Middlesex Hospital (London University) with the degree of M.R.C.S., L.R.C.P. (Gold Medallion in Surgery). Other degrees: M.B., B.S. (London); F.R.C.S. (England); F.R.C.S.C. Former appointments: Chief of Surgery, Dundurn Military Hospital, Saskatchewan, during World War II; Chief of Surgery, Royal Jubilee Hospital, Victoria, B.C.; President of the B.C. Surgical Society; Chairman of the Section of General Surgery in the B.C. Medical Association; Chief of Surgery, Algoma District Medical Group in Sault Ste. Marie, Ontario (now a 40-man group and growing).
Also by Simon Marinker:
Beyond the Citadel
Reducing the Risks of Surgery
Assassination, Preparation & Consequences