“…In most of the included studies, serum oxLDL was measured using the enzyme-linked immunosorbent assay (ELISA) method. Thirteen studies used the Mercodia oxLDL kit (Mercodia, Uppsala, Sweden) [ 31 – 37 , 44 , 45 , 47 – 49 , 55 ], three studies used the SRL kit (Tokyo, Japan) [ 39 , 40 , 51 ], one study used the USCNK Life Science Inc. kit (Wuhan, China) [ 41 ], one study used the R&D Systems Inc. kit (Minneapolis, Minnesota, USA) [ 42 ], one study used the Immundiagnostik kit (Bensheim, Germany) [ 43 ], one study used the Kyowa Medex MX kit (Kyowa Medex, Inc., Tokyo) [ 50 ], one study used the Daiichi kit (Tokyo, Japan) [ 52 ], one study used the Biomedica kit (Wien, Austria) [ 57 ], one study used ML25 (monoclonal antibody against MDA-LDL) [ 54 ], and five studies did not mention the methods used or assay kits [ 38 , 46 , 53 , 56 , 58 ].…”