University Hospital of Athens ATTIKON, Haidari-Athens, Attica, Greece
General Hospital Of Thessaloniki Papageorgiou, Thessaloniki, Nea Efkarpia, Greece
"Laiko" General Hospital of Athens, Goudi/Athens, Greece
Celerion, Lincoln, Lincoln, Nebraska, United States
Altasciences Clinical Company, Inc, Montreal, Quebec, Canada
ICON-Salt Lake City, Salt Lake City, Utah, United States
UMHAT "Sv. Ivan Rilski", Clinic of Gastroenterology, Sofia, Bulgaria
UMHAT Aleksandrovska, Sofia, Bulgaria
"DCC XX - Sofia" EOOD, Sofia, Bulgaria
Profil Institut für Stoffwechselforschung GmbH, Neuss, Germany
Aurora FDRC Inc., Costa Mesa, California, United States
Clinical Trial Res Assoc,Inc, Plantation, Florida, United States
Midwest Inst For Clin Res, Indianapolis, Indiana, United States
Charité Research Organisation GmbH, Berlin, Germany
Tianjin Medical University Chu Hsien-I Memorial Hospital, Tianjin, China
Advanced Investigative Medicine, Inc., Hawthorne, California, United States
Scripps Whittier Diabetes Inst, La Jolla, California, United States
Clinical Trials Research, Lincoln, California, United States