title: Theoretical sampling.
authors.affiliation: Department of Health Sciences, University of Genoa, Italy. annamaria.bagnasco@unige.it.
authors.forename: Annamaria
authors.initials: A
authors.lastname: Bagnasco
authors.forename: Luca
authors.initials: L
authors.lastname: Ghirotto
authors.forename: Loredana
authors.initials: L
authors.lastname: Sasso
mesh_terms: D007558:Italy; D008962:Models, Theoretical; D036301:Qualitative Research; D018401:Sample Size