4Bagucka B, De Schepper J, Peelman M, et al. Acid gastro -esophageal reflux in the 10 degrees-reversed-Trendelenburg position in supine sleeping infants[J]. Acta Paediatr Taiwan, 1999, 40(5): 298 - 301.
5Friesen C A, Hodge C, Roberts C C. Accuracy and reproducibility of 12 h esophageal pH monitoring[J]. J Pediatr Gastroenterol Nutr, 1991, 12(2):166- 168.