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The use of DBS for screening has several advantages over screening in plasma: only a minor amount of blood is required, and it can be easily collected, shipped and stored

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Arch Intern Med 162(12):13491360 Yafi FA, Sharlip ID, Becher EF (2018) Update on the safety of phosphodiesterase type 5 inhibitors for the treatment of erectile dysfunction

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If its less, it might be hypospermia

On the Cancer.net site, the American Society of Clinical Oncology (ASCO) provides a range of fact sheets on side effects, including appetite loss, diarrhea, and fatigue