Ursodeoxycholic acid versus placebo in women with intrahepatic cholestasis of pregnancy (PITCHES): a randomised controlled trial. by Chappell, L, Bell, J, Smith, A, Linsell, L, Juszczak, E, Dixon, P, Chambers, J, Hunter, R, Dorling, J, Williamson, C, Thornton, J, Pitches Study Group