Risk factors for schizophrenia [2] (multiple letters)

[1]  P. Andersen,et al.  Effects of family history and place and season of birth on the risk of schizophrenia. , 1999, The New England journal of medicine.

[2]  R. Murray,et al.  Heritability estimates for psychotic disorders: the Maudsley twin psychosis series. , 1999, Archives of general psychiatry.

[3]  M. Kramer,et al.  Clinical Epidemiology and Biostatistics , 1988, Springer Berlin Heidelberg.