9. Putative non-prescription/prescription cognitive enhancers (e.g. ginkgo, high-dose vitamin E, lecithin, estrogen, non-steroidal anti-inflammatory drugs [NSAIDs]) will not be excluded but will be discouraged. If a putative cognitive enhancer is present, the dosage must have been stable for at least 3 months prior to the screening visit and should not change during the course of the study.