Estimating the sample size for a pilot randomised trial to minimise the overall trial sample size for the external pilot and main trial for a continuous outcome variable.
Whitehead AL, Julious SA, Cooper CL, Campbell MJ.
Stat Methods Med Res. 2016 Jun;25(3):1057-73. doi: 10.1177/0962280215588241. Epub 2015 Jun 19.
PMID:26092476
PICO, PICOS and SPIDER: a comparison study of specificity and sensitivity in three search tools for qualitative systematic reviews.
Methley AM, Campbell S, Chew-Graham C, McNally R, Cheraghi-Sohi S.
BMC Health Serv Res. 2014 Nov 21;14:579. doi: 10.1186/s12913-014-0579-0.
PMID:25413154
Pilot and feasibility studies: is there a difference from each other and from a randomised controlled trial?