| Http://: https://www.ncbi.nlm.nih.gov/pubmed/19417767 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/10780781 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/1956279 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/19417767 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/10780781 | 
| Http://: https://www.ncbi.nlm.nih.gov/pubmed/1956279 |