Table 1.

Study dates

Action	Study dates	Involved colleagues
Ethical committee	March–June 2017	Working group
Submission study proposal	Dec 2016–August 2017	Working group
Invitation centres	October–January 2017
Translation questionnaires	March–September 2017	All
Study agreement	May–June 2017	All
Data collection	September 2017–September 2018	All
Data cleaning	September 2018–December 2018	Giessen
Data analysis	January 2019–April 2019	Jörg Kupfer and Florence Dalgard
First article	May–November 2019	All
Following articles	January 2020–January 2022	All