1. Department of Veterans Affairs, Veterans Health Administration, Biomedical Laboratory Research and Development, White River Junction, Vermont.
2. Department of Physiology, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire.
3. Department of Microbiology/Immunology, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire.
4. Department of Medicine, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire.