TY  - RPRT
TI  - Introduction and historical perspective.
AU  - Ronald J Wapner
AU  - Thaddeus Waters
PY  - 2003
DO  - 10.1097/00003081-200303000-00017
UR  - https://pubmed.ncbi.nlm.nih.gov/12686902/
ID  - 12686902
ER  -