Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Konstantina Vasileiou and Julie Barnett and Susan Thorpe and Terry Young,Characterising and justifying sample size sufficiency in interview-based studies: systematic analysis of qualitative health research over a 15-year period,BMC Medical Research Methodology,1471-2288,Springer Science and Business Media LLC,2018-11-21,18,1,148,https://cir.nii.ac.jp/crid/1362825895859659648,https://doi.org/10.1186/s12874-018-0594-7