1. Blankenstein Hospital, Hattingen, Germany
2. National Bogomolets Medical University, Kyiv, Ukraine
3. International Health Centre, The Hague, Netherlands
4. Medical Faculty University, Nis, Serbia
5. University of Padua, Padua, Italy
6. University Hospital “Tsaritsa Yoana”, Sofia, Bulgaria
7. Servicio Andaluz de Salud, Marbella, Spain
8. Vilnius University Children Hospital, Vilnius, Lithuania
9. Shaare Zedek Medical Center, Jerusalem, Israel