University of São Paulo, Brazil
University "La Sapienza" , Switzerland
GASTER – PLARIS- Colsubsidio Bogotá, Colombia
Airlangga University, Indonesia
University de Ciencias Biomédicas Austral, Argentina
Faculty of Medicine University, Indonesia
Alexandria University, Egypt
Pediatric Surgeon, Transplant Surgeon Ukraine
International Islamic University of Malaysia
Campo Real University, Brazilian
Kayseri City, Turkey
Tizi Ouzou University, Algeria
Damascus University, Syria
Menoufia University (Egypt) and Reflect Center (Saudi Arabia)
Assistant Professor at Lady Reading Hospital in Peshawar, Pakistan
University of Thessaloniki, Greece
Kayseri University, Turkey
Basildon University NHS Hospital, United Kingdom
General Surgery, Paraguay
Damascus University, Syria.