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Viechtbauer W, Smits L, Kotz D, et al. A simple formula for the calculation of sample size in pilot studies. J Clin Epidemiol. 2015;68(11):1375-9doi: 10.1016/j.jclinepi.2015.04.014.
Viechtbauer, W., Smits, L., Kotz, D., Budé, L., Spigt, M., Serroyen, J., & Crutzen, R. (2015). A simple formula for the calculation of sample size in pilot studies. Journal of clinical epidemiology, 68(11), 1375-9. https://doi.org/10.1016/j.jclinepi.2015.04.014
Viechtbauer, Wolfgang, et al. "A simple formula for the calculation of sample size in pilot studies." Journal of clinical epidemiology vol. 68,11 (2015): 1375-9. doi: https://doi.org/10.1016/j.jclinepi.2015.04.014
Viechtbauer W, Smits L, Kotz D, Budé L, Spigt M, Serroyen J, Crutzen R. A simple formula for the calculation of sample size in pilot studies. J Clin Epidemiol. 2015 Nov;68(11):1375-9. doi: 10.1016/j.jclinepi.2015.04.014. Epub 2015 Jun 06. PMID: 26146089.
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