TY  - RPRT
TI  - Mobile health services: a study in cost-effectiveness.
AU  - G Walker
AU  - O Gish
PY  - 1977
DO  - 10.1097/00005650-197704000-00001
UR  - https://pubmed.ncbi.nlm.nih.gov/404480/
ID  - 404480
ER  -