Notice a pattern to where the studies are? They ar

Notice a pattern to where the studies are? They are all in hot climates, mostly Florida, California, Nevada (and Alabama).

I wonder -- does anyone know if there is a higher incidence of psoriasis in warm/sunny climates? I always thought that ultraviolet was supposed to be helpful to people with psoriasis. Puzzled.

United States, Alabama
Cellceutix Study Center Not yet recruiting
Hunsville, Alabama, United States, 35801
United States, California
Cellceutix Study Center Recruiting
Encino, California, United States, 91436
United States, Florida
Cellceutix Study Center Recruiting
Coral Gables, Florida, United States, 33134
Cellceutix Study Center Recruiting
Hialeah, Florida, United States, 33016
Cellceutix Study Center Not yet recruiting
Kissimmee, Florida, United States, 34741
Cellceutix Study Center Recruiting
Miami, Florida, United States, 33126
Cellceutix Study Center Recruiting
Miami, Florida, United States, 33144
Cellceutix Study Center Not yet recruiting
Miami, Florida, United States, 33144
Cellceutix Study Center Not yet recruiting
Pembroke Pines, Florida, United States, 33026
United States, Nevada
Cellceutix Study Center Recruiting
Las Vegas, Nevada, United States, 89119