Additional file 2: of The CIPRUS study, a nurse-led psychological treatment for patients with undifferentiated somatoform disorder in primary care: study protocol for a randomised controlled trial SitnikovaKate LeoneStephanie ZonneveldLyonne van MarwijkHarm BosmansJudith van der WoudenJohannes van der HorstHenriĂŤtte 2017 SPIRIT Checklist. (DOC 120 kb)