1. I.Mechnikov North-Western State Medical University, 1/28 Santiago de Cuba str., St. Petersburg, Russian Federation, 194291
2. I.P.Pavlov First Saint Petersburg State Medical University, 6–8 L’va Tolstogo str., Saint Petersburg, Russian Federation, 197022
3. Leningrad Regional Clinical Hospital, 45 Lunacharskogo prospect, St. Petersburg, Russian Federation, 197022