Yalcin, S., Orun, E., Mutlu, B., Madendag, Y., Sinici, I., Dursun, A., Ozkara, H., Ustunyurt, Z., Kutluk, S. & Yurdakok, K. (2010) Why are they having infant colic? A nested case-control study. PAEDIATRIC AND PERINATAL EPIDEMIOLOGY , 24(6), 584-596.