WHOLISWorld Health Organization Library Information System
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We also searched using the same search term "streptococcus suis" in other databases, including Virtual Health Library, SIGLE, WHOLIS, LILACS, IMSEAR-HELLIS, and China Academic Journals Full-text Database and checked the reference lists of retrieved articles.
We did a comprehensive review of the literature on delays in obstetric care from 1980 to 2011 using the keywords: "three delays", time factors, obstetrics, obstetrical care, patient acceptance of health care, health services accessibility, delivery of health care, quality of health care, maternal mortality, maternal morbidity, pregnancy outcome and related terms on Pubmed, ISI, SciELO, EMBASE, Google Scholar and WHOLIS library.