Scott Marilyn J, Heumann Michael A, DeBruyckere Diane M, Brundage Thomas W, Kohn Melvin A
Department of Human Services, Oregon Health Division, Environmental and Occupational Epidemiology, Portland 97232, USA.
Wilderness Environ Med. 2002 Fall;13(3):206-8. doi: 10.1580/1080-6032(2002)013[0206:tfousp]2.0.co;2.