(d1: House dust mite, i6: German cockroach, tx4: Tree pollen mix, e5: Dog dander, mx1: mold mix, f1: Egg whites, f2: Cow’s milk, f23: Crab, f24: Shrimp; EC: East China, CC: Central China, NC: North China, NEC: Northeast China, NWC: Northwest China, SC: South China, SWC: Southwest China)