In 2013, UCSF School of Medicine began to offer fourth-year medical students a month-long elective centered around improving Wikipedia's health-related articles. Between 2013 and 2015, 43 students took part in the course and chose a single health-related article to work on. A study of their contributions by UCSF faculty found that the students expanded their articles, added higher-quality sources, removed lower-quality sources, and improved readability.