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Handling editor Anna Maria Geretti
Contributors VB, RP, JD and CK contributed to the study design and developing analysis plan. AFau, JD, RA, CK, VB and AE contributed to the analysis and interpretation of data. VB and AE wrote the first draft of the manuscript and subsequent drafts after revisions. CK reviewed all versions of the manuscript. VB, AE, AFau, JD, LS, AC, AFay, BS, TO, MF, RT, M-AV, VP, ET, GM, RP and CK contributed to the recruitment of participants, reviewed the final version of the manuscript and contributed to the interpretation of the data.
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.
Provenance and peer review Not commissioned; internally peer reviewed.