1. Department of Anesthesiology and Perioperative Medicine; Mayo Clinic; Rochester MN USA
2. Department of Nutrition and Exercise Physiology; University of Missouri; Columbia MO 65211 USA
3. Department of Physiology; Michigan State University; East Lansing MI 48823 USA
4. Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences; University at Buffalo; Buffalo NY USA