Evaluation of the Arabin cervical pessary for prevention of preterm birth in women with a twin pregnancy and short cervix (STOPPIT-2): An open-label randomised trial and updated me... oleh Jane E Norman, John Norrie, Graeme MacLennan, David Cooper, Sonia Whyte, Sue Chowdhry, Sarah Cunningham-Burley, Xue W Mei, Joel B E Smith, Andrew Shennan, Stephen C Robson, Steven Thornton, Mark D Kilby, Neil Marlow, Sarah J Stock, Phillip R Bennett, Jane Denton, STOPPIT-2 collaborative group