Before revision: It was jointly established by the World Health Organization (WHO) and United Nations Educational, Scientific and Cultural Organization (UNESCO) in 1949 as a successor to the International Medical Congress that organized 17 conferences from 1867 until the 1913 outbreak of World War One .
After revision: It was jointly established by the World Health Organization (WHO) and United Nations Educational, Scientific and Cultural Organization (UNESCO) in 1949 as a successor to the International Medical Congress that organized 17 conferences from 1867 until the 1913 outbreak of World War I .