M. M. Grönlund et al. “Mode of Delivery Directs the Phagocyte Functions of Infants for the First 6 Months of Life”. Clinical and Experimental Immunology 116, № 3 (1999); M. M. Grönlund et al. “Fecal Microflora in Healthy Infants Born by Different Methods of Delivery: Permanent Changes in Intestinal Flora after Cesarean Delivery”. Journal of Pediatric Gastroenterology and Nutrition 28, № 1 (1999).