The singer Halsey shared a diagnosis of a rare T-cell lymphoproliferative disorder. Learn about what this disorder is, what causes it, and how it's treated.
美国人：我们正被困在一个瘟疫肆虐、酝酿内乱的国家|密歇根州|特朗普 sina.com.cn - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sina.com.cn Daily Mail and Mail on Sunday newspapers.