Gastrointestinal Neoplasms

• St.James Hospital and Clinic — Bardejov, Slovakia
• Oncologic Institute of St.Elisabeth OUSA — Bratislava, Slovakia
• National Cancer Institute, Slovakia — Bratislava, Slovakia
• Zdravspol s r.o. - oncologic ambulance — Komárno, Slovakia

• University of Chicago Hospitals — Chicago, Illinois, United States

• Sepulveda Ambulatory Care Center, VA Greater Los Angeles Healthcare System — Los Angeles, California, United States
• S. Barbara Hospital — Iglesias, CA, Italy
• N. S. di Bonaria Hospital — San Gavino Monreale, VS, Italy

• Sepulveda Ambulatory Care Center, VA Greater Los Angeles Healthcare System — Los Angeles, California, United States
• S. Barbara Hospital — Iglesias, Cagliari, Italy
• N. S. di Bonaria Hospital — San Gavino Monreale, VS, Italy

• Roswell Park Cancer Institute — Buffalo, New York, United States

Not specified

• Department of Internal and Complementary Medicine, Immanuel Hospital Berlin — Berlin, Germany
• Department for Internal and Integrative Medicine, Essen-Mitte Clinics — Essen, Germany

• Digestive Service, Huc — San Cristóbal de La Laguna, S/c de Tenerife, Spain
• Hospital Universitario de Canarias — San Cristóbal de La Laguna, S/c de Tenerife, Spain

• Hospital Universitario de Canarias — Santa Cruz de Tenerife, Spain

• Heartland International Health Center — Chicago, Illinois, United States