TY  - RPRT
TI  - Methods of data collection.
AU  - M E Megel
AU  - J A Heermann
PY  - 1994
DO  - 10.1097/00006527-199406000-00014
UR  - https://pubmed.ncbi.nlm.nih.gov/7831403/
ID  - 7831403
ER  -