{{Cite journal| doi = 10.2337/dc12-2693| issn = 1935-5548 (Electronic) 0149-5992 (Print) 0149-5992 (Linking)| volume = 36| issue = 6| pages = –85| last1 = Bodmer| first1 = M.| last2 = Jick| first2 = S. S.| last3 = Meier| first3 = C. R.| title = Comment on: Suissa and Azoulay. Metformin and the risk of cancer: time-related biases in observational studies. Diabetes Care 2012;35:2665-2673| journal = Diabetes Care| date = 2013-05-25| pmid = 23704693}}