GSTM1 and antiphospholipid syndrome: TSH: Thyroid-stimulating hormone; FT3: Free triiodothyronine; FT4: Free thyroxine; TRAb: TSH receptor antibodies; ANA: Antinuclear antibodies; ENA: Extractable nuclear antigen; dsDNA: Double-stranded DNA antibodies; APS: Antiphospholipid syndrome; ACL: Anticardiolipin antibodies; β2GP1: Beta-2 glycoprotein I antibodies; ESR: Erythrocyte sedimentation rate; HIV: Human immunodeficiency virus; HBsAg: Hepatitis B surface antigen; HCV: Hepatitis C virus; ACE: Angiotensin-converting enzyme; Hb: Hemoglobin; ATIII: Antithrombin III