[THE REPORT ABOUT THE XVTH JUBILEE CONGRESS OF GASTROENTEROLOGICAL SCIENTIFIC SOCIETY OF RUSSIA, THE 17TH INTERNATIONAL SLAVIC-BALTIC SCIENTIFIC FORUM "ST. PETERSBURG--GASTRO 2015" AND EUROPEAN ASSOCIATION FOR GASTROENTEROLOGY, ENDOSCOPY AND NUTRITION (EAGEN) POSTGRADUATE COURSE "MODERN SOCIETY LIFESTYLE, NUTRITION AND GI DISORDERS"].