Patient readiness for shared decision making about treatment: Conceptualisation and development of the Ready^SDM.

"CONFLICT OF INTEREST STATEMENT The authors declare no conflicts of interest."

"The authors thank Nanny van Duijn‐Bakker (Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Netherlands) for her help with conducting the longitudinal interviews, and Dr. Hanna Bomhof‐Roordink (Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Netherlands) for her advice on questionnaire development. The authors thank Peter Heine (kanker.nl) for his help with the recruitment of participants for the field tests, and Eline Heemskerk and Sevde Koca (Pharos, The Netherlands) for conducting the comprehensibility test. The authors thank the members of our advisory committee who provided feedback on the elements and subelements, including the representatives of the Dutch Federation of Cancer Patient Organisations (NFK), Patiëntenvereniging Hoofd‐Hals (PVHH) and Stichting Darmkanker. The authors thank all participating patients, adults with low literacy, clinicians, and healthcare communication experts for their time and dedication. This work was financially supported by the Dutch Cancer Society, grant number 11710. The funding agreements ensured the authors' independence in designing the study, interpreting the data, writing and publishing the report."