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Contributors JIdG-O, AMdG-B, GS-C and JCL-A had substantial involvement in the drafting of the letter. All authors gave approval of this final version of the paper.
Competing interests JIdG-O has received honoraria for lecturing, scientific advice, participation in clinical studies or writing for publications for Almirall, AstraZeneca, Chiesi, Esteve, Faes, Gebro, GlaxoSmithKline, Menarini, Pfizer and Rovi.
Patient consent Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
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