Edit: compared to the version sent via email, I added one more link to the first paragraph and used the 20 days from symptoms onset to result in official statistics data point from the study and the 10 days from test results to incorporation in official statistics to come up, by subtraction, to the 10 days from symptoms onset to test results.
Data quality matters more than data analysis
Edit: compared to the version sent via email, I added one more link to the first paragraph and used the 20 days from symptoms onset to result in official statistics data point from the study and the 10 days from test results to incorporation in official statistics to come up, by subtraction, to the 10 days from symptoms onset to test results.