TY  - RPRT
TI  - The research problem, purpose, hypotheses: what is this study about?
AU  - J A Heermann
AU  - M E Megel
PY  - 1993
DO  - 10.1097/00006527-199301330-00016
UR  - https://pubmed.ncbi.nlm.nih.gov/8121943/
ID  - 8121943
ER  -