Circulating Tumor Cells in Renal Cell Carcinoma: Recent Findings and Future Challenges - Santoni, Matteo; Cimadamore, Alessia; Cheng, Liang; Lopez-Beltran, Antonio; Battelli, Nicola; Massari, Francesco; Scarpelli, Marina; Galosi, Andrea Benedetto; Bracarda, Sergio; Montironi, Rodolfo (Frontiers in Oncology, 2019)