Funding for this research was provided by:
EuroQol Research Foundation (Grant number EQ Project 2016160)
Received: 10 April 2019
Accepted: 11 May 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: This study was approved by the Medical Ethics Committee Brabant, the Netherlands. Patients needed to give permission for participation in the BIOS study. Informed consent forms were sent together with the T1 questionnaire or together with questionnaires sent at later time points when the patient did not respond to the T1 questionnaire.
: Not applicable.
: This study was funded by the EuroQoL group (Grant number EQ Project 2016160), of which GJB is a member.