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RAC and CSR are joint senior authors.
Contributors JTH and CSR drafted the response. All authors reviewed and edited the final response. RAC and CSR are guarantors of the research described in this publication.
Funding Work conducted at the National Jewish Health was partially supported by the Reuben M Cherniack fellowship award. Work conducted in Israel was partially supported by the Committee for Research and Prevention in Occupational Safety and Health (56/13). The funders had no role in the conduct or interpretation of these research findings.
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.