Effects of work burden, job strain and support on depressive symptoms and burnout among Japanese physicians oleh Yasuaki Saijo, Shigeru Chiba, Eiji Yoshioka, Yasuyuki Kawanishi, Yoshihiko Nakagi, Toshihiro Itoh, Yoshihiko Sugioka, Kazuyo Kitaoka-Higashiguchi, Takahiko Yoshida