Comorbidities: 28.6% of patients had internal diseases such as hypertension (12.9%), cardiovascular diseases (2.9%), diabetes (4.3%), bronchitis (2.9%), past tuberculosis, urinary tract infection (5.7%). 4.2% of patients once had general diseases namely surgery of small bowel perforation caused by blunt abdominal trauma (1.4%), surgery of laparoscopic appendectomy (1.4%), surgery of right-hand amputation due to war wound (1.4%).