1. Institute of Physiology, Siberian Branch of the Russian Academy of Medical Sciences, Novosibirsk, Russia; Institute of Internal Medicine, Siberian Branch of the Russian Academy of Medical Sciences, 2a, Vladimirovsky spusk, Novosibirsk 630003, Russia.
2. Centre for Chronobiology, Psychiatric University Clinic, CH-4025 Basel, Switzerland
3. Bühlmann Laboratories, CH-4124 Schönenbuch, Switzerland
4. Columbia University & New York State Psychiatric Institute, New York, NY 10032, USA