Link to review on vitamin D.

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 ## Topical or time-specific links: ##
 
+* [Global perspective of COVID‐19 epidemiology for a full‐cycle
+  pandemic](https://onlinelibrary.wiley.com/doi/abs/10.1111/eci.13423)
+  (*European Journal of Clinical Investigation*, 2020-10-07).
+  Provides a global perspective on the pandemic.  Simulations are
+  presented with a total of 1.58 to 8.76 million COVID-19 deaths over
+  5 years globally.
+
 * [COVID-19 and the Path to
   Immunity](https://jamanetwork.com/journals/jama/fullarticle/2770758)
   (JAMA Viewpoint, 2020-09-11).  Summarizes various aspects of immune
   response to Covid-19 infection, and its durability.
 
+* [A Basic Review of the Preliminary Evidence That COVID-19 Risk and
+  Severity Is Increased in Vitamin D
+  Deficiency](https://www.frontiersin.org/articles/10.3389/fpubh.2020.00513/full)
+  (*Frontiers in Public Health*, 2020-09-10).  “Among the 47 original
+  research studies summarized here, chart reviews found that serum
+  vitamin D levels predicted COVID-19 mortality rates (16 studies) and
+  linearly predicted COVID-19 illness severity (8 studies). […] Widely
+  recommending 2,000 IU of vitamin D daily for all populations with
+  limited ability to manufacture vitamin D from the sun has virtually
+  no potential for harm and is reasonably likely to save many lives.”
+
 * [Use of “normal” risk to improve understanding of dangers of
   covid-19](https://www.bmj.com/content/370/bmj.m3259.full) (*British
   Medical Journal* analysis, 2020-09-09).  Compares risk of dying by