Intraprostatic Botulinum Toxin Type A Injection in Patients Unfit for Surgery Presenting with Refractory Urinary Retention and Benign Prostatic Enlargement. Effect on Prostate Volume and Micturition Resumption - Silva, J.; Silva, C.; Saraiva, L.; Silva, A.; Pinto, R.; Dinis, P.; Cruz, F. (European Urology, 2008)