1. Biorhythmology Laboratory of the Institute of Environmental Physiology, N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, 163001 Arkhangelsk, Russia
2. Central Scientific Research Laboratory, Northern State Medical University, 163069 Arkhangelsk, Russia
3. Department of Public Health, National Medical Research Centre for Therapy and Preventive Medicine, 101000 Moscow, Russia
4. Department of Community Medicine, UiT The Arctic University of Norway, N-9037 Tromsø, Norway