Greg Simon

Impact of visit copayments on outpatient mental health utilization by members of a health maintenance organization.

G. Simon, L. Grothaus, M. Vonkorff, 1996, The American journal of psychiatry.

Form, frequency and burden of sleep problems in general health care: a report from the WHO Collaborative Study on Psychological Problems in General Health Care

Y. Lecrubier, N. Sartorius, T. Üstün, 1996, European Psychiatry.