Effects of Coffee Consumption on Bowel Recovery after Gynecologic Oncology Surgery

Interventions: 12 g Americano coffee mixed in 100 ml warm water (100 mg of caffeine) 3 times a day at 7.00, 12.00, and 17.00,Synthetic coffee product mixed in 100 ml warm water 3 times a day at 7.00, 12.00, and 17.00;Active Comparator Dietary Supplement,Active Comparator Dietary Supplement;coffee,Placebo Primary outcome(s): the first farting 72 hours after a surgery operation Timing Observation Study Design: Randomized