1. Ege University, Izmir, Turkey
2. Celal Bayar University, Manisa, Turkey
3. Atatürk Training and Research Hospital, Izmir, Turkey
4. Numune Hospital, Adana, Turkey
5. Ankara University, Ankara, Turkey
6. Atatürk University, Erzurum, Turkey
7. Pamukkale University, Denizli, Turkey
8. Trakya University, Edirne, Turkey
9. Cumhuriyet University, Sivas, Turkey
10. Erasmus Medical Center, Division of Epidemiology, Rotterdam, Holland
11. Rize University, Rize, Turkey
12. Istanbul University, Istanbul, Turkey
13. Dicle University, Diyarbakir, Turkey