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Competing interests: AL has received fees for speaking, research or travel support from AstraZeneca, Merck Sharp & Dhome, Pfizer, Almirall Prodesfarma and TAP. LAG-R has received fees for speaking from Merck Sharp & Dhome, Pfizer and AstraZeneca, and research grants from Pfizer and AstraZeneca. FG, EQ, LR and JMP have received fees for speaking and research grants or travel support from AstraZeneca, Merck, Pfizer and Almirall Prodesfarma. The other authors have not reported conflict of interest.
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