Figure 1.

Flow chart describing the literature search process. The literature search was conducted on PubMed, ScienceDirect, and Web of Science databases and limited to original clinical trials with human participants published after January 1st, 2005. One-hundred-and-thrity-five abstracts and full texts were reviewed. Eighty studies not reporting both ACN source and blood pressure markers were excluded. Eleven additional relevant studies were identified during the screening process from the reference lists, and were added to the review.