Protocol (1998) https://doi.org/10.1002/14651858.CD001055 Original review (1999) DOI: 10.1002/14651858.CD001055 (this first version of the review is not available in the Cochrane Library) Review update (2004) https://doi.org/10.1002/14651858.CD001055.pub2 Review update (2009) https://doi.org/10.1002/14651858.CD001055.pub3 Review update (2013) https://doi.org/10.1002/14651858.CD001055.pub4 Review update (2017) https://doi.org/10.1002/14651858.CD001055.pub5.
Freijah et al. (Tue,) studied this question.