1Me Grath SK, Kennell JH. Induction of labor and doula support[J]. Pediatric Res, 1998,43 (4) : Part Ⅱ, 14A.
2Gilliland AL. Beyond holding hands: the modern role of the professional doula[J]. Journal of Obstetric, Gyneco- logic, and Neonatal Nursirg: JOGNN/NAACOG, 2002, 31:762-769.
9Gilliland AL. After praise and encouragement: Emotional support strategies used by birth doulas in the USA andCanada[J]. Midwifery,2011,27(4) :525-31.