Using stated-preferences methods to develop a summary metric to determine successful treatment of children with a surgical condition: a study protocol oleh Nigel Hall, Marian Knight, Nick Lansdale, Lisa Hinton, Charles Opondo, Simon Kenny, Stefano Giuliani, John Buckell, Oliver Rivero-Arias, Kokila Lakhoo, Alexander Macdonald, Crispin Jenkinson, Benjamin Allin, Rema Ramakrishnan, Gregor Walker, Timothy Bradnock, Karolina Kuberska, Benjamin M Craig, Goher Ayman, Anna May Long, Joanne Shepherd