The effects of atorvastatin 30 mg compared with atorvastatin 40 mg in patients with primary hyperlipidemia: a multicenter study Christos Rizos, Evangelos Liberopoulos, Eleni Mpilianou, Vasileios Kotsis, Nikolaos Tentolouris, Christina Antza, Ioanna Eleftheriadou, Vasileios Tsimihodimos, Moses Elisaf