Birth ball for pregnant women in labour research protocol: a multi-centre randomised controlled trial von Yeung, May Pui Shan, Tsang, Katrina Wai Kay, Yip, Benjamin Hon Kei, Tam, Wing Hung, Ip, Wan Yim, Hau, Florence Wai Lei, Wong, Margaret Kit Wah, Ng, Judy Wai Ying, Liu, Sau Ha, Chan, Sophia Shu Wing, Law, Chi Kin, Wong, Samuel Yeung Shan

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