I seriously thank you for the link. I fully intend to follow through with all the sublinks to the studies themselves. However, this one statement on the title page is what raises a red flag for me: "Multiple treatments are typically used in combination, which may be significantly more effective."
My question is: Used in combination with what? How do we know that it wasn't the vitamin C, D3, or combination of other treatments that caused the positive results? Or, as we have seen many times, some patients seem to rapidly throw off the virus and have a fast recovery due to no apparent reason. A good example of this would be my 61 year-old neighbor who has COPD and emphysema. She does good to walk from her front door to her mailbox without stopping to rest. Covid took her husband in 14 days, yet she seemed to fully recover from it in about 3 days with no special treatment other than Azithromycn. However, she still tested positive for over a week.
The studies are discussed in detail, you can click on each one for a discussion and/or to view the study directly. That should answer your questions.