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Table 1 Search strategy for PubMed

From: The microbial changes in subgingival plaques of orthodontic patients: a systematic review and meta-analysis of clinical trials

Literature search was conducted up to 11/2016 PubMed results
# 1 orthodontic* OR “fixed appliance*” 61454
# 2 subgingival 5292
# 3 bacteria[Mesh] OR bacteria OR periodontopathogen* OR pathogen* OR microorganism OR microbe OR plaque OR biofilm OR microflora  2531627
#4 #1 AND #2 AND #3 89