Group members who have travelled abroad for treatment have discovered they had microclotting issues which had previously gone undetected. 1 Krumholz HM, Wu Y, Sawano M, Shah R, Zhou T, Arun AS, Khosla P, Kaleem S, Vashist A, Bhattacharjee B, Ding Q, Lu Y, Caraballo C, Warner F, Huang C, Herrin J, Putrino D, Hertz D, Dressen B, Iwasaki A.