the article that conducted this study was: ransjo-arvidson, anna-berit rnmtd, phd; matthiesen, ann-sofi bsc; lilja, gunilla rnmtd; nissen, eva rnmtd, phd; widstrom, ann-marie rnmtd, phd; uvnas-moberg, kerstin md, phd maternal analgesia during labor d...