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?PharmaTimes??????????????????????????36?????????????????Cialis???? tadalafil???????????2011?13???????????????????????????????????????
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?????TOPICS 2005.07.12?FDA????????????????????????
???Pfizer ponders possible OTC version of Viagra
???????PharmaTimes World News 2007.1.11?
????Push for over-the-counter Viagra?BBC NEWS 2007.1.12?
?????http://news.bbc.co.uk/1/hi/health/6254813.stm
????AP????12?????