1. Department of Internal Medicine, Keimyung University Dongsan Hospital, Daegu, Republic of Korea
2. Department of Internal Medicine, Keimyung University Dongsan Hospital, Daegu, Republic of Korea, Department of Allergology, Hospital Serive of Kavaje, Albania
3. Department of Statistics, Kyungpook National University, Daegu
4. Department of Occupational & Environmental Medicine, Sungso Hospital, Andong, Republic of Korea