[1] Univ Groningen, Univ Med Ctr Groningen, Groningen Res Inst Asthma & COPD, Dept Allergol, NL-9713 GZ Groningen, Netherlands
[2] Univ Groningen, Univ Med Ctr Groningen, Dept Pathol & Med Biol, NL-9713 GZ Groningen, Netherlands
[3] Univ Groningen, Univ Med Ctr Groningen, Dept Hematol, NL-9713 GZ Groningen, Netherlands