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

來源: 於 2019-02-11 20:56:51 [舊帖] [給我悄悄話] 本文已被閱讀：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