Paediatric asthma and non-allergic comorbidities: A review of current risk and proposed mechanisms.

"CONFLICT OF INTEREST Jonas Ludvigsson has coordinated an unrelated study on behalf of the Swedish IBD quality register (SWIBREG), which received funding from Janssen corporation. Henrik Larsson reports receiving grants from Shire Pharmaceuticals; personal fees from and serving as a speaker for Medice, Shire/Takeda Pharmaceuticals, and Evolan Pharma AB; and sponsorship for a conference on attention‐deficit/hyperactivity disorder from Shire/Takeda Pharmaceuticals and Evolan Pharma AB, all outside the submitted work."

"This work was ably assisted by the Karolinska Institute library, which prepared the literature search; in particular, thanks to Jonas Pettersson and Emma‐Lotta Saatela. We acknowledge funding from the Swedish Research Council (grant no 2018‐02640) and the Swedish Heart‐Lung Foundation (grant no 20210416). Contributions: BB & CA conceived the idea. All authors contributed to the analysis plan, search strategy, interpretation of data and approved the manuscript for submission. BB, ECO, TG, AH, MM, AS and CA sorted and collated the relevant papers from the literature search and wrote the first draft of the manuscript including the Supplementary Tables and creation of Figures. Jonas Ludvigsson has coordinated an unrelated study on behalf of the Swedish IBD quality register (SWIBREG), which received funding from Janssen corporation. Henrik Larsson reports receiving grants from Shire Pharmaceuticals; personal fees from and serving as a speaker for Medice, Shire/Takeda Pharmaceuticals, and Evolan Pharma AB; and sponsorship for a conference on attention‐deficit/hyperactivity disorder from Shire/Takeda Pharmaceuticals and Evolan Pharma AB, all outside the submitted work."