Notes
1. There are suspected but poorly understood connections between MS and vitamin D deficiency: http://www.mssociety.org.uk/ms-news-and-research/ms-research/potential-treatments/emerging-areas-of-research/vitamin-d
2. See the information sheet of the National Cancer Institute: http://www.cancer.gov/cancertopics/factsheet/prevention/vitamin-D
See Harvard School of Public Health, The Public Health Dispar- ities Geocoding Project Monograph: http://www.hsph.harvard.edu/thegeocodingproject/webpage/monograph/introduction.htm