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Twitter @DrAJRodriguezM
Contributors JPE-A and AJR-M conceived the idea and the study design. CAM-C and JPE-A collected the data. LEA-A, MAB-S, DKB-A and AJR-M analysed the data. AJR-M wrote the first draft. All the authors read and approved the subsequent versions and the final submitted 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.
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Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.