Master of Science is generally abbreviated M.S. or MS in countries following United States usage and MSc or M.Sc. in countries following British usage, where MS would refer to the degree of Master of Surgery. In Australia, some extended master's degrees use the title "doctor": Juris doctor and Doctors of Medical Practice, Physiotherapy, Dentistry, Optometry and Veterinary Practice. Despite their titles these are still master's degree and may not be referred to as doctoral degrees, nor may graduates use the title "doctor".