1. Narodni Front Clinic for Gynecology and Obstetrics Belgrade, Serbia
2. Leskovac General Hospital, Leskovac, Serbia
3. Dr. Laza Lazarević Clinic for Mental Disorders, Belgrade, Serbia
4. Jevremova Special Gynecology Hospital with Maternity Ward, Belgrade, Serbia;
5. Stanford University, School of Medicine, Palo Alto, California, United States