Cengiz AB, Yıldırım İ, Ceyhan M, Seçmeer G, Gür D, Kara A. Comparison of nasopharyngeal culture, polymerase chain reaction (PCR) and serological test for diagnosis of pertussis. Turk J Pediatr 2009; 51: 309-316. https://doi.org/10.24953/turkjpediatr.2009.2308