[1] Marshfield Clin Hlth Syst, Hosp Med, Marshfield, WI USA
[2] Ronald Regan UCLA Med Ctr, Dept Rheumatol, Los Angeles, CA USA
[3] Marshfield Clin Hlth Syst, Dept Pathol 4, Marshfield, WI USA
[4] Christiana Care Hlth Serv Inc, Pulm & Crit Care Med, Newark, DE USA