Tom wrote: > I > really don't have the time to cite refs (as I am super busy with other > efforts)...... you > can access Medline........ please check > Medline (available for free on the web, use search engine to find URL) Sometimes Medline can be a little intimidating, if you're unfamiliar. Here are some easy ways to get in (the first is the most "user friendly") http://www.healthgate.com/HealthGate/MEDLINE/search.shtml http://www.ncbi.nlm.nih.gov/Entrez/medline.html http://www.ncbi.nlm.nih.gov/htbin-post/Entrez/query?db=m Love Liza -- [log in to unmask] (Liza May)