RT Journal Article SR Electronic T1 Is a Painless Labor Possible? JF Science Translational Medicine FD American Association for the Advancement of Science SP 22ec40 OP 22ec40 DO 10.1126/scitranslmed.3001024 VO 2 IS 22 A1 Cheng, Elaine YR 2010 UL http://stm.sciencemag.org/content/2/22/22ec40.abstract