With the advancement of modern medicine beginning in the 18th century, bonesetters began to be recognised for their efficiency in treatment but did not receive the praise or status that physicians did. Some of these self-taught healers were considered legitimate, while others were perceived as "quacks". In Great Britain, one of the most famous was the bonesetter Sally Mapp (d. 1737). Known as "Crazy Sally", she learned her skill from her father and was known for her arm strength and ability to reset almost any bone. Though she lacked the medical education of physicians, she successfully treated dislocated shoulders and knees, among other treatments, at the Grecian Coffee House in London and in the town of Epsom.