ADAM33 and childhood onset asthma: The TT-genotype of ADAM33 rs511898 (p = 0.03), the CG/GG-genotype of ADAM33 rs528557 (p = 0.08) and the TT-genotype of ORMDL3/GSDMB rs7216389 (p = 0.08) were negatively associated with childhood asthma.