8DE SOUSA L,GOMES-SPONHOLZ F A,NAKANO AM. Transcutaneous electrical nerve stimulation for the reliefof post-partum uterine contraction pain during breast-feeding: a randomized clinical trial [J].- J Obstet GynaecolRes, 2014, 40(5): 1317-1323.
9WEN L, HILTON G, CARVALHO B, The impact ofbreastfeeding on postpartum pain after vaginal and cesareandelivery[J]. J Clin Anesth, 2015,27(1) : 33-38.
10HOLDCROFT A,SNIDVONGS S,CASON A, et al. Painand uterine contractions during breast feeding in theimmediate post-partum period increase with parity[J]. Pain,2003,104(3) ? 589-596.