TY  - RPRT
TI  - The system has to work both ways to be efficient.
AU  - Mutaz B Habal
PY  - 2005
DO  - 10.1097/01.scs.0000174613.33610.d2
UR  - https://pubmed.ncbi.nlm.nih.gov/16077291/
ID  - 16077291
ER  -