Appendix 1. Search strategy

#1 (preterm or premature or 'before term' or 'early onset')
#2 (labour or labor or delivery or birth)
#3 (relaxation or meditation or biofeedback or massage or reflexology or deep breathing or hypnosis or visualisation or aromatherapy or yoga or water therapy or music therapy)
#4 1 and 2 and 3