1 Spectrum Health Internal Medicine, Grand Rapids, Mich.
2 Spectrum Health Allergy and Immunology, Grand Rapids, Mich.
3 Spectrum Health Allergy and Immunology, Grand Rapids, Mich; Helen Devos Children's Hospital Allergy and Immunology, Grand Rapids, Mich; Michigan State University College of Human Medicine, Grand Rapids, Mich.
4 Spectrum Health Allergy and Immunology, Grand Rapids, Mich; Helen Devos Children's Hospital Allergy and Immunology, Grand Rapids, Mich; Michigan State University College of Human Medicine, Grand Rapids, Mich. Electronic address: Nicholas.hartog@spectrumhealth.org.