| PPI | Penile prosthesis implantation |
| ED | Erectile dysfunction |
| MMAS | Massachusetts Male Aging Study |
| PCDU | Penile colour Doppler ultrasound |
| NPTR | Nocturnal penile tumescence and rigidity |
| PSY | Psychogenic ED |
| ORG | Organic ED |
| IIEF | International Index for Erectile Dysfunction |
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