1. Department of Pediatrics, Sisli Etfal Training and Research Hospital, Istanbul, Turkey.
2. Department of Pediatric Infectious Diseases, Sisli Etfal Training and Research Hospital, Istanbul, Turkey.
3. Department of Microbiology, Sisli Etfal Training and Research Hospital, Istanbul, Turkey.
4. Department of Family Medicine, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey.