I eventually sent them this article, not ideal but good enough:
https://medium.com/microbial-instincts/the-first-clinical-trial-to-support-vitamin-d-therapy-for-covid-19-906a9d907468
I eventually sent them this article, not ideal but good enough:
https://medium.com/microbial-instincts/the-first-clinical-trial-to-support-vitamin-d-therapy-for-covid-19-906a9d907468