title: Correspondence (letter to the editor): Matching should take place before the start of the study.
authors: Anna
authors: A
authors: Drabik
authors: Markus
authors: M
authors: Lüngen
authors: Stephanie
authors: S
authors: Stock
authors: Christian
authors: C
authors: Graf
mesh_terms: D003924:Diabetes Mellitus, Type 2 / Q000191:economics* / Q000453:epidemiology*; D005260:Female; D017048:Health Care Costs / Q000706:statistics & numerical data*; D006760:Hospitalization / Q000191:economics*; D006801:Humans; D008297:Male