title: Comment: analyses using time-dependent pioglitazone usage in Cox models may lead to wrong conclusions about its association with cancer.
authors.forename: Xilin
authors.initials: X
authors.lastname: Yang
authors.forename: Juliana C N
authors.initials: JC
authors.lastname: Chan
mesh_terms: D003924:Diabetes Mellitus, Type 2 / Q000188:drug therapy*; D005260:Female; D006801:Humans; D007004:Hypoglycemic Agents / Q000009:adverse effects* / Q000627:therapeutic use*; D008297:Male; D009369:Neoplasms / Q000453:epidemiology* / Q000209:etiology*; D045162:Thiazolidinediones / Q000009:adverse effects* / Q000627:therapeutic use*; D001749:Urinary Bladder Neoplasms / Q000453:epidemiology* / Q000209:etiology*
chemical_list: D007004:Hypoglycemic Agents; D045162:Thiazolidinediones