sunbelt
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Introduction
Region of the USA south of the 37th or 38th parallels, north latitude (see map[1]). Sunlight exposure in winter months north of the sunbelt is generally insufficient to generate the RDA of vitamin D.
References
- ↑ Jump up to: 1.0 1.1 Wikipdia: sunbelt http://en.wikipedia.org/wiki/Sun_Belt