Description of intervention and comparator groups
Participants in the intervention group received 240 ml of In order to simulate the appearance of placebo with Participants in all groups used an electronic shower milk pump (Medela) at least 6 times a day (3–4 h after waking up from 8 a.m.) during the 7-day period to extract their human milk. Excess milk was stored in the milk bank of Shahid Akbarabadi Hospital.