1. University named after I.I. Mechnikov,North-Western State Medical,Department of the propaedeutic of internal diseases, gastroenterology and dietetics n.a. S.M. Riss,St. Petersburg,Russia
2. University “LETI”,Saint Petersburg Electrotechnical,Department of the biotechnical systems,St. Petersburg,Russia
3. University “LETI”,Saint Petersburg Electrotechnical,St. Petersburg,Russia