Dear Sanguansak,
Greetings from Al-Ain the oasis city of the Middle East. Regarding your
above posting you might find the following useful. I am just posting the
facts and not doing any interpretations!
http://www.ncbi.nlm.nih.gov/entrez/query/static/help/pmhelp.html
These definitions below are taken from the link "search field descriptions
and tags" from the above URL (they are listed alphabetically).
Entrez date:
Entrez Date [EDAT] Date the citation was added to the PubMed database. The
Entrez Date is set to the Publication Date on citations before September
1997 when this field was first added to PubMed. Citations are displayed in
Entrez Date order which is last in, first out. Dates or date ranges must be
entered using the format YYYY/MM/DD [edat], e.g. 1998/04/06 [edat] . The
month and day are optional (e.g., 1998 [edat] or 1998/03 [edat]). To enter a
date range, insert a colon (:) between each date (e.g., 1996:1997 [edat] or
1998/01:1998/04 [edat]).
Note:
The Entrez Date will remain unchanged and is not updated to reflect the date
a Publisher Supplied record is elevated to in process or when an in process
record is elevated to MEDLINE. Therefore, use caution when your strategy
includes only MeSH terms and a date or date range using the search field
tag, [edat], because the addition of MeSH terms to a record will not change
the Entrez Date [edat].
MsSH Date:
MeSH Date [MHDA] The date the citation was indexed with MeSH Terms and
elevated to MEDLINE for citations with an Entrez Date after March 4, 2000.
The MeSH Date is initially set to the Entrez Date when the citation is added
to PubMed. If the MeSH Date and Entrez Date on a citation are the same, and
the Entrez Date is after March 4, 2000, the citation has not yet been
indexed. Dates or date ranges must be entered using the format YYYY/MM/DD
[mhda], e.g. 2000/03/15 [mhda] . The month and day are optional (e.g., 2000
[mhda] or 2000/03 [mhda]). To enter a date range, insert a colon (:) between
each date (e.g., 1999:2000 [mhda] or 2000/03:2000/04 [mhda]).
Publication date:
Publication Date [DP] The date that the article was published. Dates or date
ranges must be searched using the format YYYY/MM/DD [dp], e.g. 1998/03/06
[dp] . The month and day are optional (e.g., 1998 [dp] or 1998/03 [dp]). To
enter a date range, insert a colon (:) between each date (e.g., 1996:1998
[dp] or 1998/01:1998/04 [dp]).
Note:
Journals vary in the way the publication date appears on an issue. Some
journals include just the year, whereas others include the year plus month
or year plus month plus day. And, some journals use the year and season
(e.g.,Winter 1997). The publication date in the citation is recorded as it
appears in the journal. It is recommended that you search only by year
(e.g., 1996 [dp] or 1995:1997 [dp])
Hope some one from the NLM will explaing these in non technical words.
Hope this is of some help.
Cheers & regards,
Badri
Dr.P.Badrinath M.D.,M.Phil.,(Epid) PhD(Cantab)
Clinical Assistant Professor and Epidemiologist,
Department of Community Medicine,
UAE University, PO Box 17666, Al Ain,
United Arab Emirates.
Tel: 00 971 3 7039 652
Fax: 00 971 3 7672022.
http://myprofile.cos.com/badrishanthi
"For an excellent review of the current medical literature, go to Journals
Scan www.uaeu.ac.ae/jscan/index.htm" - BMJ 3rd June 2000,Reviews(Netlines)
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