How were doctor trained about leeches in the 13th and 14th centruycom?

In the 13th and 14th centuries, doctors were trained in the use of leeches primarily through apprenticeship and the study of medical texts. They learned about the therapeutic use of leeches for bloodletting and treating various ailments by observing experienced practitioners and reading works by classical authors such as Hippocrates and Galen. Medical schools began to emerge during this period, where students would gain hands-on experience and knowledge of various treatments, including the application of leeches in medicine.