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Handling editor Josef S Smolen
Contributors JM, MS and MA participated in the conception of the study and data interpretation and drafted the manuscript. H-JA participated in the conception of the study and data interpretation. GC and RF-B conceived the study and interpreted the data. H-ML, AS, CS and REV participated in the conception. All authors participated actively in the discussions and had a prior methodological training. All gave substantial intellectual contributions, and read, revised and approved the final manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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