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Clavell M, Correa-Gracian H, Liu Z, Craver R, Brown R, Schmidt-Sommerfeld E, Udall J Jr, Delgado A, Mannick E.Clavell M, et al. Among authors: schmidt sommerfeld e.J Pediatr Gastroenterol Nutr. 2000 Jan;30(1):43-7. doi: 10.1097/00005176-200001000-00016.J Pediatr Gastroenterol Nutr. 2000.PMID: 10630438