[1] Natl Inst Publ Hlth & Environm, Dept Hlth Serv Res, NL-3720 BA Bilthoven, Netherlands
[2] Univ Groningen, GRIP, GUIDE, Groningen, Netherlands
[3] Natl Inst Publ Hlth & Environm, Lab Clin Vaccine Res, NL-3720 BA Bilthoven, Netherlands
[4] Erasmus Univ, Vaccine Ctr, NL-3000 CB Rotterdam, Netherlands