Primary tumor staging for oral cancer and a proposed modification incorporating depth of invasion: An international multicenter retrospective study

Ardalan Ebrahimi, Ziv Gil, Moran Amit, Tzu Chen Yen, Chun Ta Liao, Pankaj Chaturvedi, Jai Prakash Agarwal, Luiz P. Kowalski, Matthias Kreppel, Claudio R. Cernea, Jose Brandao, Gideon Bachar, Andrea Bolzoni Villaret, Dan Fliss, Eran Fridman, K. Thomas Robbins, Jatin P. Shah, Snehal G. Patel, Jonathan R. Clark, The International Consortium for Outcome Research (ICOR) in Head and Neck Cancer