#	Searches
1	Perinatal Care/
2	Obstetric Nursing/
3	Delivery, Obstetric/
4	Labor, Obstetric/
5	Parturition/
6	Home Childbirth/
7	Natural Childbirth/
8	or/1‐7
9	Social Support/
10	8 and 9
11	Doulas/
12	(doula or doulas or obstetric nursing).ti,ab,kf.
13	((childbirth? or birth? or labor or laboring or labour or labouring or intrapartum) adj6 (support* or companion* or coach*)).ti,ab,kf.
14	(((presence or present or attend* or accompan*) adj3 (family member? or friend? or spouse? or partner? or unskilled)) and (childbirth? or birth? or labor or labour)).ti,ab,kf.
15	(((presence or present or attend* or accompan*) adj3 (midwife or midwives or midwifery or nurse)) and (childbirth? or birth? or labor or labour)).ti,ab,kf.
16	or/11‐15
17	10 or 16
18	limit 17 to "qualitative (best balance of sensitivity and specificity)"
19	qualitative research/
20	17 and 19
21	18 or 20