Onset of Epstein-Barr virus-associated hemophagocytic lymphohistiocytosis triggered by sudden reactivation of asymptomatic latent Epstein-Barr virus infection Masanari Mizuki; Takuya Terakawa; Yuka Umeki; Hitomi Matsunaga; Yoshiki Matsuoka; Wataru Nakahara; Shogo Matsui; Mako Ikeda; Kodai Ueshima; Yuya Hayasaka; Nayu Matsuoka; Yuma Tada; Takahiro Matsui; Kazumasa Oka; Shuji Ueda;