“…No experimental studies were found; therefore only analytical epidemiological studies were included, which comprised of 27 cohort studies, two case-control studies, and one cross-sectional study. The type of psychosocial stress indicators investigated in the studies included anxiety, [21][22][23][24]27,30,35,36,48,49 depression, [22][23][24]30,35,37,41,42 bereavemet, 29,32,38 work-related stress, 33,36,47,48 and NLEs, 19,20,25,26,28,31,34,39,40,[43][44][45][46]49,50 which were usually comprised of a composite of different indicators of stressors. Most studies assessed maternal stress using self-completed validated questionnaire; in a few studies maternal stress was assessed from population registers, particularly stress resulting from bereavement of a family member.…”