Limited-stage small cell lung cancer: Outcomes associated with prophylactic cranial irradiation over a 20-year period at the Princess Margaret Cancer Centre oleh Michael Yan, Tzen S. Toh, Patricia E. Lindsay, Jessica Weiss, Katrina Hueniken, Christy Yeung, Vijithan Sugumar, Dixon Pinto, Tony Tadic, Alexander Sun, Andrea Bezjak, John Cho, Srinivas Raman, Meredith Giuliani, Fabio Ynoe Moraes, Geoffrey Liu, Andrew J. Hope, Benjamin H. Lok