> This study is clearly not a fishing expedition because vitamin D has been a topic of interest in coronavirus disease for months now with multiple studies cond

> This study is clearly not a fishing expedition because vitamin D has been a topic of interest in coronavirus disease for months now with multiple studies conducted. That others have studied something does not preclude these researchers from "fishing" their data looking for a correlation. Since we don't know what process they used, we can't say. When considering the other weaknesses (such as the small number of "comparators"), it furthers my consideration of this study being weak evidence.