(en) Folkerts, G, et al, 2000. Do common childhood infections 'teach' the immune system not to be allergic? Immunol. Today 21 (3): 118–20. abstract. Gearchiveerd op 7 november 2018.
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(en) Folkerts, G, et al, 2000. Do common childhood infections 'teach' the immune system not to be allergic? Immunol. Today 21 (3): 118–20. abstract. Gearchiveerd op 7 november 2018.