Changing platforms without stopping the train: experiences of data management and data management systems when adapting platform protocols by adding and closing comparisons oleh Dominic Hague, Stephen Townsend, Lindsey Masters, Mary Rauchenberger, Nadine Van Looy, Carlos Diaz-Montana, Melissa Gannon, Nicholas James, Tim Maughan, Mahesh K. B. Parmar, Louise Brown, Matthew R. Sydes, for the STAMPEDE and FOCUS4 investigators