1. Alexander C. McFarlane, Professor of Psychiatry, The University of Adelaide, Queen Elizabeth Hospital, South Australia
2. Rachel Yehuda, Professor of Psychiatry, Mount Sinai School of Medicine and Bronx Veterans Affairs Medical Center, New York, New York, USA. Address for correspondence: Psychiatry 116/A, Bronx Veterans Affairs, 130 West Kingsbridge Road, Bronx, NY 10468, USA.