[1]
                            https://www.ncbi.nlm.nih.gov/pubmed/?term=16634838
                            
[2] https://www.ncbi.nlm.nih.gov/pubmed/?term=10381252
                            [3] https://www.ncbi.nlm.nih.gov/pubmed/?term=15208835
                            [4] https://www.ncbi.nlm.nih.gov/pubmed/?term=23082086
                            [5] https://www.ncbi.nlm.nih.gov/pubmed/?term=18193099
                            [6] https://www.ncbi.nlm.nih.gov/pubmed/?term=22125537
                            [7] https://www.ncbi.nlm.nih.gov/pubmed/?term=16444816
                            [8] https://www.ncbi.nlm.nih.gov/pubmed/?term=25650336
                            [9] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4637499/
                            [10] https://www.ncbi.nlm.nih.gov/pubmed/25176387
                            [11] https://www.ncbi.nlm.nih.gov/pubmed/?term=8073081
                            [12] https://www.ncbi.nlm.nih.gov/pubmed/?term=17555327
                            [13] https://www.ncbi.nlm.nih.gov/pubmed/17336007
                            [14] https://www.ncbi.nlm.nih.gov/pubmed/?term=25369772
                            [15] https://www.ncbi.nlm.nih.gov/pubmed/8546437
                            [16] https://www.ncbi.nlm.nih.gov/pubmed/?term=22515411
                            [17] https://www.ncbi.nlm.nih.gov/pubmed/?term=17506119
                            [18] http://care.diabetesjournals.org/content/26/4/1147
                            [19] https://www.ncbi.nlm.nih.gov/pubmed/?term=18160753
                            [20] https://www.ncbi.nlm.nih.gov/pubmed/1991440