<prompt> Translate the following text to EnglishUtafiti huo ulitumia aina tatu tofauti za uchambuzi: mahojiano ya simu ya mteja, uchambuzi wa data kugundua mwenendo wa bili unaojulikana kusababisha malipo ya ziada, na ukaguzi wa rekodi za matibabu.  <response>: The 2001 study used three different types of analyses-client telephone interviews, data analysis identifying billing trends that are known to result in overpayments, and medical record review. 