Map of eight provinces (outlined in blue) with hospitals participating in the health care personnel survey on influenza and COVID-19 vaccinations—Thailand.
Two provinces in each of Thailand’s four regions were selected by simple random sampling. The tertiary hospital for each province and one community hospital selected by simple random sampling were included (16 total hospitals). https://www.cia.gov/static/99eb69ecead8f4848ee59a1c90487ed8/thailand-administrative.jpg .
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