J Clin Epidemiol. 2013 Sep;66(9):1058-9. doi:
10.1016/j.jclinepi.2012.12.020. Epub 2013 Jul 9. 

Stepped wedge cluster randomized trials are efficient and provide a
method of evaluation without which some interventions would not be
evaluated. 
Hemming K, Girling A, Martin J, Bond SJ.

J Clin Epidemiol. 2014 Jul;67(7):834-6. doi: 10.1016/j.jclinepi.2014.02.015. Epub 2014 Apr 29.

Response to Keriel-Gascou et al.: higher efficiency and other alleged
advantages are not inherent to the stepped wedge design. 
Viechtbauer W1, Kotz D2, Spigt M3, Arts IC4, Crutzen R5.

J Clin Epidemiol. 2013 Sep;66(9):1059-60. doi: 10.1016/j.jclinepi.2013.05.004.

The stepped wedge design does not inherently have more power than a
cluster randomized controlled trial. 

Kotz D, Spigt M, Arts IC, Crutzen R, Viechtbauer W.

Researchers should convince policy makers to perform a classic cluster
randomized controlled trial instead of a stepped wedge design when an
intervention is rolled out. 

Kotz D, Spigt M, Arts IC, Crutzen R, Viechtbauer W.

J Clin Epidemiol. 2012 Dec;65(12):1255-6. doi:
10.1016/j.jclinepi.2012.06.016. Epub 2012 Sep 8. No abstract
available.