ANG and diabetes mellitus: Four of these studies investigated the associations between serum ANG levels and type 1 diabetes mellitus (T1DM) [59–62], 3 studies investigated the associations between serum ANG levels and type 2 diabetes mellitus (T2DM) [63–65], and 1 study investigated the associations between serum ANG levels and both diseases [66] (SupplementaryTable 1).