The CHESS trial: protocol for the process evaluation of a randomised trial of an education and self-management intervention for people with chronic headache.
Vivien P NicholsDavid R EllardFrances E GriffithsMartin UnderwoodStephanie J C TaylorShilpa Patelnull nullPublished in: Trials (2019)
ISRCTN79708100 . Registered on 16 December 2015.