 The details of the Nazi Doctors' Trial at Nuremberg which ended August 1947 and the revelations about what the Imperial Japanese Army had done at Unit 731 in China during the war clearly demonstrated the need for reform, and for a re-affirmed set of guidelines regarding both human rights and the rights of patients.A study committee was appointed to prepare a "Charter of Medicine" which could be adopted as an oath or promise that every doctor in the world would make upon receiving his/her medical degree or diploma.It took two years of intensive study of the oaths and promises submitted by member associations to draft a modernized wording of the ancient oath of Hippocrates which was sent for consideration at the WMA's second general assembly in Geneva in 1948.