•
平台:
BMJ Journals
(Available from 2007.)
BMJ Journals Archive
(Available from 1944 volume: 1 issue: 1 until 2006.)
JSTOR Life Sciences Collection
(Available from 1994/01/01 volume: 51 issue: 1. Most recent 4 year(s) not available.)
ProQuest Agricultural & Environmental Science Database
(Available from 1994/01/01 volume: 51 issue: 1. Most recent 6 month(s) not available.)
ProQuest SciTech Premium Collection
(Available from 1994/01/01 volume: 51 issue: 1. Most recent 6 month(s) not available.)
PubMed Central
(Available from 1994 volume: 51 until 2007 volume: 64 issue: 12.)