1. Tampere Center for Child Health Research; Tampere University and University Hospital; Tampere Finland
2. Seinäjoki Central Hospital; Seinajoki Finland
3. Allergy Centre; Tampere University Hospital; Tampere Finland
4. Department of Clinical Physiology; Tampere University Hospital; Tampere Finland
5. Department of Clinical Physiology; Turku University Hospital; Turku Finland