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Association between natural factors and SLE
| Definite | Probable | ||
|---|---|---|---|
| UVR | Season distribution | Climate factors | Geographical distribution |
| UVB | Winter and spring | Temperature | Latitude |
| UVA | Atmospheric pressure | Longitude | |
| Mean humidity | Altitude | ||
| Precipitation | |||
| Wind speed | |||
Abbreviation: UVR: ultraviolet radiation, UVB: ultraviolet B, UVA: ultraviolet A.
