Obermann
Senior Member (Voting Rights)
Actually it goes back to the 1930s at least.
Agreed. Most propositions like the biopsychosocial model don't appear in a vacuum, but are developments and refinements of older ideas. Engel started to discuss the topic already in 1960. However, his paper in 1977 was influential and is usually quoted as the starting point of the biopsychosocial model in review papers (Borrell-Carrió et al., Ann Fam Med, 2004).
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