The barber surgeon, one of the most common European medical practitioners of the Middle Ages, was generally charged with caring for soldiers during and after battle. In this era, surgery was seldom conducted by physicians, but instead by barbers, who, possessing razors and coordination indispensable to their trade, were called upon for numerous tasks ranging from cutting hair to amputating limbs. In this period, surgical mortality was very high due to blood loss and infection. Yet, since doctors thought that blood letting treated illness, barbers also applied leeches. Meanwhile, physicians considered themselves to be above surgery. Physicians mostly observed surgical patients and offered consulting, but otherwise often chose academia or working in universities. Some chose to reside in castles, where they treated the wealthy. Due to religious and sanitary monastic regulations, monks had to maintain their tonsure (the traditional baldness on the top of the head of Catholic monks). This created a market for barbers, because each monastery had to train or hire a barber. They would perform bloodletting and other minor surgeries like pulling teeth or creating ointments. The first barber surgeons to be recognized as such worked in monasteries around 1000 AD. Because physicians performed surgery so rarely, the Middle Ages saw a proliferation of barbers, among other medical "paraprofessionals", including cataract couchers, herniotomists, lithotomists, midwives, and pig gelders. In 1254, Bruno da Longobucco, an Italian physician who wrote on surgery, was concerned about barbers performing phlebotomies and scarifications. In Paris, disputes between doctors led to the widespread patronage of barbers. The College of St. Cosme had two levels of student doctors: doctors who were given a long academic robe were permitted to perform surgeries and doctors who were given a short robe and had to pass a special examination before being given that license. The short-robed doctors were bitter because the long-robed physicians behaved pretentiously.