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

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