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Table 1 Electronic databases used for searching

From: How effective are created or restored freshwater wetlands for nitrogen and phosphorus removal? A systematic review

Database

Searched field

No of hits

Date

ISI web of science

Topic

3249

2013-02-26

Georef and geobase

Subject/title/abstract

2249

2013-02-26

Scopus

Title, abstract and keywords

2842

2013-02-26

Agricola

Keyword anywhere

524

2013-02-26

ASFA

All fields (no full text)

1933a

2013-02-27

Academic search

Title/abstract/subject/keyword

1131

2013-02-27

Biological abstracts

Keywords

401

2013-02-27

Wiley online library

Abstract or title or keywords

174

2013-02-27

Directory of open access journals

All fields

84a

2013-03-05

ScienceDirect

Abstract or title or keywords

876

2013-07-02

  1. aAfter removal of duplicates