Guidelines for inclusion of patient-reported outcomes in clinical trial protocols: The SPIRIT-PRO Extension by Calvert, M, Kyte, D, Mercieca-Bebber, R, Slade, A, Chan, A, King, M, the SPIRIT-PRO Group

Systematic evaluation of the patient-reported outcome (PRO) content of clinical trial protocols by Kyte, D, Duffy, H, Fletcher, B, Gheorghe, A, Mercieca-Bebber, R, King, M, Draper, H, Ives, J, Brundage, M, Blazeby, J, Calvert, M