Viagra

فياغرا: قصة اختراع صُمم لهدف آخر

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كانت شركة فايزر Pfizer (شركة ادوية أمريكية) تعمل على تطوير علاج لاضطراب القلب، الا ان ا لتجارب السريرية أظهرت ان العلاج الجديد كان ع...

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