Studies were searched and retrieved from online databases (PubMed, EMBASE, BIOSIS, and ScienceDirect). 
PubMed
Studies were searched and retrieved from online databases (PubMed, EMBASE, BIOSIS, and ScienceDirect). 
EMBASE
Studies were searched and retrieved from online databases (PubMed, EMBASE, BIOSIS, and ScienceDirect). 
BIOSIS
Studies were searched and retrieved from online databases (PubMed, EMBASE, BIOSIS, and ScienceDirect). 
ScienceDirect