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Contributors RJPGC, TC, OB-B and IA were involved in the concept, design and data acquisition. VK contributed to the formulation of the asthma bags. RJPGC wrote the initial draft, and TC, OB-B, IA and VK revised the draft and gave the final approval.
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; externally peer reviewed.