TY  - RPRT
TI  - Viewpoint: provider licensing--a monopoly won't work.
AU  - G P Sawyer
DO  - 10.1002/j.2048-7940.1981.tb00697.x
UR  - https://pubmed.ncbi.nlm.nih.gov/6914879/
ID  - 6914879
ER  -