best cialis online 4 T P 97 94 Oral 24 5 mg once-daily Aged 18 years with ED symptoms 3 months RCT Sidney G 2014 Multicenter 63 T F P F 346 350 Oral 26 5 mg once-daily Adult men aged RCT Soodong K 2017 Korea 69 T P 59 36 Oral 24 5 mg once-daily Aged 18 years with ED symptoms after NSRP RCT Thomas M 2014 USA, Canada 63 T P 121 121 Oral 30 5 mg once-daily Aged 18 years with ED symptoms after radiotherapy RCT Young Eun S 2014 Korea 69 T P 47 45 Oral 24 5 mg once-daily Aged 18 years with ED symptoms after NSRP RCT