- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4763469
- https://pubmed.ncbi.nlm.nih.gov/14518774
- https://pubmed.ncbi.nlm.nih.gov/26448271
- https://pubmed.ncbi.nlm.nih.gov/18681988
- https://pubmed.ncbi.nlm.nih.gov/30308973
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4566026
- https://pubmed.ncbi.nlm.nih.gov/18326618
- https://pubmed.ncbi.nlm.nih.gov/29345213
- https://pubmed.ncbi.nlm.nih.gov/19597519
- https://pubmed.ncbi.nlm.nih.gov/27867678
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2748751
- https://pubmed.ncbi.nlm.nih.gov/31242953
- https://pubmed.ncbi.nlm.nih.gov/28036057
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3390139
- https://pubmed.ncbi.nlm.nih.gov/26448271
- https://pubmed.ncbi.nlm.nih.gov/19735169
- https://pubmed.ncbi.nlm.nih.gov/30153655
- https://pubmed.ncbi.nlm.nih.gov/30320348