Evaluation of proliferative index and cell cycle protein expression in choroid plexus tumors in children - Carlotti Júnior, Carlos Gilberto; Salhia, Bodour; Weitzman, Sheila; Greenberg, Mark; Dirks, Peter B.; Mason, Warren; Becker, Lawrence E.; Rutka, James T. (Acta Neuropathologica, 2002)