“…But the broad approach advocated by Koller and Diem continued to be used, being frequently cited in both the German and Anglophonic(Kalb, 1916; Luxenburger, 1928),(Snell, 1921),(Schulz, 1928),(Sünner, 1922),(Paskind, n.d.; Barrett, 1925; Paskind, 1930; Paskind, 1933) literatures. For example, in 1925, Barrett wrote a review paper for the US Archives of Neurology and Psychiatry on “Hereditary and Familial Factors in the Development of the Psychoses” in which Diem's work was mentioned 11 times (Barrett, 1925). Furthermore, the Koller‐Diem burden paradigm was conceptually related to an approach popular in the later 20th century of dividing patients into those who were “family history positive” or “familial” vs. “family history negative” or “sporadic” (e.g., Katz & McGuffin, 1987; Kendler & Hays, 1982; Limosin, Gorwood, & Ades, 2001; Penick, Read, Crowley, & Powell, 1978; Walker & Shaye, 1982; Winokur, 1979).…”