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Determining esophageal length from crown-rump length.
Putnam PE, Orenstein SR. Putnam PE, et al. J Pediatr Gastroenterol Nutr. 1991 Nov;13(4):354-9. doi: 10.1097/00005176-199111000-00004. J Pediatr Gastroenterol Nutr. 1991. PMID: 1779308