The earliest recorded observation of possible links between maternal alcohol use and fetal damage was made in 1899 by Dr. William Sullivan, a Liverpool prison physician who noted higher rates of stillbirth for 120 alcoholic female prisoners than their sober female relatives; he suggested the causal agent to be alcohol use. This contradicted the predominating belief at the time that heredity caused intellectual disability, poverty, and criminal behavior, which contemporary studies on the subjects usually concluded. A case study by Henry H. Goddard of the Kallikak family—popular in the early 1900s—represents this earlier perspective, though later researchers have suggested that the Kallikaks almost certainly had FAS. General studies and discussions on alcoholism throughout the mid-1900s were typically based on a heredity argument.