TY - JOUR T1 - Standing and walking for < 5 hours per work day increased the risk for preterm delivery JF - Evidence Based Medicine JO - Evid Based Med SP - 28 LP - 28 DO - 10.1136/ebm.1995.1.28 VL - 1 IS - 1 A2 - , Y1 - 1995/12/01 UR - http://ebm.bmj.com/content/1/1/28.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -