Frequency of use and cost in Japan of first-line palliative chemotherapies for recurrent or metastatic squamous cell carcinoma of the head and neck

Kazuki Yokoyama, Koichiro Wasano, Keita Sasaki, Ryunosuke MacHida, Mitsuhiko Nakahira, Koji Kitamura, Tomofumi Sakagami, Naohiro Takeshita, Akira Ohkoshi, Motoyuki Suzuki, Ichiro Tateya, Yohei Morishita, Mariko Sekimizu, Masahiro Nakayama, Taiji Koyama, Hirofumi Shibata, Satoru Miyamaru, Naomi Kiyota, Nobuhiro Hanai, Akihiro Homma