Good hygiene may be to blame for soaring AD in the West accordin

来源: 于 2019-02-11 20:56:51 [旧帖] [给我悄悄话] 本文已被阅读：次

Lack of exposure to germs, viruses and parasites harms the immune system - to rising rates of AD in richer nations.  不懂就是不懂，好吧