GSTM1 and diabetic ketoacidosis: TPOAb: thyroid peroxidase antibody; SDS: standard deviation score; BMI: body mass index; TSH: thyroid-stimulating hormone; ULN: upper limit of normal; Hb: hemoglobin; MCV: mean corpuscular volume; DKA: diabetic ketoacidosis; GADA: glutamic acid decarboxylase antibody