//updated [S. Wayne Chan, Biomedical Research Informatics Development Group, HIIS Div., QHS Dept., Univversity of Massachusetts Medical School]
//swc20110705 replaced hard-coded filename with one that incorporates a caller-specifiable keyword as well as date-time stamp for uniqueness
//swc20120227 replaced '<?=' with '<?php echo ' in the <body> statement, per Greg Schulte (Children's Hospital Colorado), to prevent blank resulting .XLS due to 'short_open_tag = Off' in php.ini