Key points are not available for this paper at this time.
Protocol: doi.org/10.1002/14651858.CD008349 Original review (2011): doi.org/10.1002/14651858.CD008349.pub2 Review update (2015): doi.org/10.1002/14651858.CD008349.pub3 Review update (2017): doi.org/10.1002/14651858.CD008349.pub4.
Laver et al. (Thu,) studied this question.