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1 Freitas VM, "Use of phosphodiesterase-5 inhibitors by college students" 42 : 965-967, 2008
2 Shindel AW, "The sexual lives of medical students: a single institution survey" 5 : 796-803, 2008
3 Ayta IA, "The likely worldwide increase in erectile dysfunction between 1995 and 2025 and some possible policy consequences" 84 : 50-56, 1999
4 Rosen RC, "The international index of erectile function (IIEF):a multidimensional scale for assessment of erectile dysfunction" 49 : 822-830, 1997
5 Laumann EO, "Sexual dysfunction in the United States: prevalence and predictors" 281 : 537-544, 1999
6 Bechara A, "Recreational use of phosphodiesterase type 5 inhibitors by healthy young men" 7 : 3736-3742, 2010
7 Harte CB, "Recreational use of erectile dysfunction medications in undergraduate men in the United States:characteristics and associated risk factors" 40 : 597-606, 2011
8 Santtila P, "Recreational use of erectile dysfunction medication may decrease confidence in ability to gain and hold erections in young males" 19 : 591-596, 2007
9 Korkes F, "Recreational use of PDE5 inhibitors by young healthy men: recognizing this issue among medical students" 5 : 2414-2418, 2008
10 Gebreslassie M, "Psychoactive substances use and associated factors among Axum University students, Axum Town, North Ethiopia" 13 : 693-, 2013
11 Kimura M, "Profiling characteristics of men who use phosphodiesterase type 5 inhibitors based on obtaining patterns: data from the nationwide Japanese population" 9 : 1649-1658, 2012
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13 Lowe G, "Phosphodiesterase type 5 inhibitor abuse: a critical review" 4 : 87-94, 2011
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18 NIH Consensus Conference, "Impotence. NIH consensus development panel on impotence" 270 : 83-90, 1993
19 Mulhall J, "Importance of and satisfaction with sex among men and women worldwide: results of the global better sex survey" 5 : 788-795, 2008
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23 Li J, "Alcohol and drug use during unprotected anal intercourse among gay and bisexual men in Scotland:what are the implications for HIV prevention?" 90 : 125-132, 2014
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25 Both R, "A matter of sexual confidence: young men's nonprescription use of Viagra in Addis Ababa, Ethiopia" 18 : 495-508, 2016