Optimal Timing for Assessment of Tumor Response to Neoadjuvant Chemoradiation in Patients With Rectal Cancer: Do All Patients Benefit From Waiting Longer Than 6 Weeks? - Perez, Rodrigo O.; Habr-Gama, Angelita; São Julião, Guilherme P.; Gama-Rodrigues, Joaquim; Sousa Jr., Afonso H. S.; Campos, Fabio Guilherme; Imperiale, Antonio R.; Lynn, Patricio B.; Proscurshim, Igor; Nahas, Sergio Carlos; Ono, Carla Rachel; Buchpiguel, Carlos Alberto (International Journal of Radiation : Oncology-Biology-Physics, 2012)