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Contributors JDB and MRE selected the systematic review. MRE wrote the first draft of the manuscript. JDB and MRE contributed to interpretation of the data and revision of drafts, approved the final manuscript and are guarantors.
Competing interests JDB receives a 10% share of the royalties for the sale of inhaled mannitol (Aridol/Osmohale) paid to Royal Prince Alfred Hospital by the manufacturer Pharmaxis Ltd.
Provenance and peer review Not commissioned; internally peer reviewed.
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