1. Mechnikov Research Institute for Vaccines and Sera, Moscow, Russia.
2. Department of Viral Hepatitis, Russian Medical Academy of Continuous Professional Education, Moscow, Russia.
3. Medical Institute of the North-Eastern Federal University Named After M.K. Ammosov, Yakutsk, Republic of Sakha (Yakutia), Russia.
4. Arctic State Agrotechnological University, Yakutsk, Republic of Sakha (Yakutia), Russia.