400,000 doses from Pfizer's were received in Japan on Friday.
- Vaccination will begin rolling out in the days ahead, expected to start on Wednesday
- First in line will be around 20,000 doctors and nurses
- the two shots will be administered three weeks apart
- 3.7 million front-line health workers are to begin receiving the vaccine in March
- followed by 36 million people aged 65 or older, likely from Apri
