TY - JOUR T1 - What is causing the ‘long-hauler’ phenomenon after COVID-19? JF - Cleveland Clinic Journal of Medicine JO - Cleve Clin J Med SP - 273 LP - 278 DO - 10.3949/ccjm.88a.21009 VL - 88 IS - 5 AU - Leonard H. Sigal Y1 - 2021/05/01 UR - http://www.ccjm.org/content/88/5/273.abstract N2 - ER -