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Destroy this report when no longer needed. Do not return to the originator. DISCLAIMERS: The findings in this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. In conducting the work described in this report, the investigators adhered to the "Guide for the Care and Use of Laboratory Animals, " NIH Publication 86-23, revised in 1985. The use of trade names does not constitute an official endorsement or approval of the use of such commercial hardware or software. This document may not be cited for purposes of advertisement. REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-01B8 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining th