Levon N Grigoryan, General, Laparoscopic and Bariatric Surgeon, Coloproctologist, Endoscopist at Slavmed Medical Center, shared a post on Facebook:
“Dear prof. Gerhard Prager. Very proud to know you and to have had the opportunity to have you as a mentor in my professional career. Wishing you a day as wonderful as the lessons you share.” Happy Birthday.”