“…Thirteen studies used an RCT design [3-7, 25, 27-30, 32, 34, 36]; three employed a case study design [26,31,33], and another used a retrospective cohort design [35]. Five studies included women within the first trimester [4,6,25,26,34]. One author (da Silva) was the first named on four studies [5,7,27,28], and two authors were first named on two articles, Elden [29,30] and Ternov, who was also cited as Kvorning [32,35].…”