1. Robinson JO (1984) The barber-surgeons of London. Arch Surg 119(10):1171–1175
2. Penn Medicine (2013) History of Pennsylvania Hospital: Surgical Amphitheater. Available at http://www.uphs.upenn.edu/paharc/tour/tour5.html . Accessed Jan 10 2014
3. Massachusetts General Hospital: Neurosurgical Service, The Ether Dome: The restoration of an icon, May 11, 2005. Available at http://neurosurgery.mgh.harvard.edu/History/restore.htm . Accessed 10 Jan 2014
4. Old Operating Theater: Museum and Herb Garret. St. Thomas’s in the 19th Century, 2007. Available at http://www.thegarret.org.uk/pdfs/exhibitions/stthomashospital19THcentury.pdf . Accessed 10 Jan 2014
5. McCullough LB (2006) John Gregory’s medical ethics and the reform of medical practice in eighteenth-century Edinburgh. J R Coll Phys Edinburgh 36:86–92