“…All of the biobehavioral skills-building studies utilized appropriate data analytical approaches and ten provided good/clear information about their inclusion and exclusion criteria [8, 22–25, 28, 38, 39, 42, 46, 48, 49]. Similarly, the majority of the studies also had good/clear sampling procedures [8, 22–26, 28, 38, 39, 41, 42, 46, 49]; but, five studies had small sample sizes - under 50 couples [16, 38, 42, 46, 49].…”