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Characteristics of studies included in the systematic review. This table presents details of all the studies that were included in the review and their citations (end of the table). The studies are grouped according to the type of relationship they identified, with some studies finding more than one pattern of relationship. (DOCX 150 kb)

Reasons for exclusion of full text articles from the review. This file lists all the full text articles that were excluded from the present review along with the reason for their exclusion. (DOCX 36 kb)

Risk of flaws in each individual study and across studies. The table contains the risk of flaws between and within studies against all major and minor domains that were evaluated. The meanings of abbreviations are as follow: L = Low risk of flaw; H = High risk flaw; U = Unclear risk flaw; NA = not applicable. (DOCX 71 kb)