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Olen O, Gudjónsdóttir AH, Browaldh L, Hessami M, Elvin K, Liedberg AS, Neovius M, Grahnquist L.Olen O, et al. Among authors: gudjonsdottir ah.J Pediatr Gastroenterol Nutr. 2012 Dec;55(6):695-700. doi: 10.1097/MPG.0b013e3182645c54.J Pediatr Gastroenterol Nutr. 2012.PMID: 22722680