id,postId,link,kind
3472,16639,https://doi.org/10.1016/j.vaccine.2010.10.026,external-link
3473,16639,https://web.archive.org/web/20210423203212/https://www.who.int/immunization/monitoring_surveillance/burden/vpd/surveillance_type/active/poliomyelitis_standards/en/,external-link
3474,16639,https://ourworldindata.org/polio,internal-prominent-link