**Biomarkers in the Overactive Bladder Syndrome**

Célia Duarte Cruz1,2,3, Tiago Antunes Lopes2,3,4, Carlos Silva2,3,4 and Francisco Cruz2,3,4,\* *1Department of Experimental Biology, Faculty of Medicine of Porto, 2IBMC – Instituto de Biologia Molecular e Celular, 3University of Porto, 4Department of Urology, Hospital de S. João, Porto, Portugal* 
