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. 2012 Sep 12;2012(9):CD001901. doi: 10.1002/14651858.CD001901.pub2

Boon 2002.

Methods
Participants
Interventions
Outcomes
Notes This is a cross‐over trial where separate data pertaining to the first treatment period only has not been made available upon request. We therefore cannot analyse the first treatment period as if it were a parallel trial (see Methods)