| Http://: https://www.ncbi.nlm.nih.gov/pubmed/21378989 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/21378985 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/9714016 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/21378989 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/21378985 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/9714016 |