Created at	Source	Raw Value	Validated value
Oct. 26, 2020, 11:31 p.m.	usa	- those who know that they have already suffered from covid-19 - those who have received a vitamin d supplement in the previous two weeks. - difficulty obtaining blood samples	- those who know that they have already suffered from covid-19 - those who have received a vitamin d supplement in the previous two weeks. - difficulty obtaining blood samples