TY  - RPRT
TI  - Qualitative research: standards, challenges, and guidelines.
AU  - K Malterud
PY  - 2001
DO  - 10.1016/s0140-6736(01)05627-6
UR  - https://pubmed.ncbi.nlm.nih.gov/11513933/
ID  - 11513933
ER  -