Polio vaccine and Gresham's law.
Sathyamala
C
C
Puliyel
Jacob M
JM
D002648:Child; D003365:Costs and Cost Analysis; D006801:Humans; D017589:Immunization Programs; D007194:India; D011051:Poliomyelitis / Q000517:prevention & control*; D023321:Poliovirus Vaccines / Q000191:economics*
D023321:Poliovirus Vaccines