2005
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1149438/
2006
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7124135/
2008
https://pubmed.ncbi.nlm.nih.gov/19036930/
2009
https://pubmed.ncbi.nlm.nih.gov/19153232/
2010
https://pubmed.ncbi.nlm.nih.gov/19906932/
2013
https://pubmed.ncbi.nlm.nih.gov/23365422/