[Polio].
Bol
P
P
D002648:Child; D014943:Global Health; D006801:Humans; D009426:Netherlands / Q000453:epidemiology; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control; D023321:Poliovirus Vaccines
D023321:Poliovirus Vaccines
Polio.