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Table 1 Search strategy in Web of Science and PubMed

From: The strong focus on positive results in abstracts may cause bias in systematic reviews: a case study on abstract reporting bias

Database/search engine Web of Science Core Collection (WoSCC) PubMed
Broad search query ((diesel) and (exhaust or particulate matter or microparticles or emissions or exposure)) AND (cancer or carcino* or neoplasm or tumo*)) (((diesel) and (exhaust or particulate matter or microparticles or emissions or exposure)) AND (cancer or carcinogen* or carcinoma or carcinomas or carcinomous or carcinoid or carcinoids or neoplasm or tumor or tumour or tumorous or tumors or tumours)) AND (Humans[Mesh])
Specific search query (restricted to bladder cancer) ((diesel) and (exhaust or particulate matter or microparticles or emissions or exposure)) AND (cancer or carcino* or neoplasm or tumo*)) AND(bladder or urinary or transitional) (((diesel) and (exhaust or particulate matter or microparticles or emissions or exposure)) AND (cancer or carcinogen* or carcinoma or carcinomas or carcinomous or carcinoid or carcinoids or neoplasm or tumor or tumour or tumorous or tumors or tumours)) AND (Humans[Mesh]) AND (bladder or urinary or transitional)
Search fields ‘Topic’ (abstract, title, author keywords, KeyWords Plus) ‘All fields’ (including abstract, title, author keywords, MeSH terms)
Database-specific keywords KeyWords Plus, added by Clarivate Analytics based on each article’s reference list [12] MeSH terms, suggested by an algorithm based on the full-text of each article and manually checked by professional indexers from the U.S. National Library of Medicine [13]
Search date 16 September 2018 16 September 2018
  1. Notes: Applying the WoSCC search query including wildcards to PubMed led to an error message stating that there were too many references that could not all be shown. Therefore we made some minor adaptations to the query in PubMed. The PubMed search is automatically expanded to include relevant MeSH terms. The broad search query was used to identify all the relevant articles for our study sample. The specific search query was used to check the assumption that it would fail to identify articles with incomplete abstract reporting