Phumdoung, S.; Manasurakarn, B.; Rattanasombat, K.; Mahattanan, S.; Maneechot, K.; Chanudom, B.; Kaewnak, S. Effect of the Prince of Songkla University Birthing Bed on Duration, Pain, and Comfort Level During Second-Stage Labor in Primiparous Thais. PRIJNR 2013, 17, 56-67.