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Ask the question again tomorrow when Dr. O will be back answering questions. I believe he's does piggybacks
JCH MD
http://www.medhelp.org/posts/Eye-Care/the-best-solution-for-me/show/711988
I have found this article which describes such a technique. If you want I can send you full text by e-mail.
http://www.ncbi.nlm.nih.gov/pubmed/17081900?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum