Chang Kao, The Twelve Medical Talks , 1179, Cautionary tales against professional faults (Summary) , Program in Human Rights and Medicine in the Medical School at the University of Minnesota

"Another important work on medical ethics is The Medical Talks written by Chang Kao in 1189. In a special chapter he collected twelve stories of retribution in order to warn physicians against professional faults. Gratuitous service was especially commended. Lusting after women and riches was considered to be immoral. The inducing of artificial abortion was severely denounced." (Lee, 269)

Source: T'ao Lee,  "Medical Ethics in Ancient China," Bulletin of the History of Medicine 13 (1943): 268-277.