protección contra seis enfermedades: difteria, tos convulsa, tétanos, Haemophilus influenzae tipo b, hepatitis B y poliomielitis

Every story that involves protección contra seis enfermedades: difteria, tos convulsa, tétanos, Haemophilus influenzae tipo b, hepatitis B y poliomielitis, ranked by how well its sources corroborate it.

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