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You are studying gastroesophageal reflux therapy among two hundred premature infants all of whom are less than 30 weeks and being tube fed in a NICU. You measure the average intraesophageal pH upon entry into the study, at two weeks, at four weeks and at six weeks. The best method to analyze this data is: Group of answer choices repeat measures ANOVA Pearson's correlation coefficient regression using a model that includes time, volume of feeds and intraespohageal pH Chi-square