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