University of Southern California (USC), Los Angeles, California, United States
Institute of Esophageal and Reflux Surgery, Englewood, Colorado, United States
Stanford Center for Clinical Research, Stanford, California, United States
University Hospital Vienna, Vienna, Austria
Fundacion Favaloro, Buenos Aires, Argentina
Klinikum Memmingen, Memmingen, Germany
INDISA Clínica da Familia, Santiago, Chile
Chinese University of Hong Kong (CUHK) / Prince of Whales, Hong Kong, Hong Kong
Hospital Clinico de la Pontificia Universidad Catolica de Chile, Santiago, Chile
San Ignacio, Bogota, Colombia