Canada came out with support for first doses first: https://www.canada.ca/en/public-health/services/immunization/national-advisory-committee-on-immunization-nac

Canada came out with support for first doses first: https://www.canada.ca/en/public-health/services/immunization/national-advisory-committee-on-immunization-naci/rapid-response-extended-dose-intervals-covid-19-vaccines-early-rollout-population-protection.html https://www.canada.ca/en/public-health/services/immunization...