For the second phase, each subject will be followed for survival status at 36 months after enrollment. Such follow-up will be done by searching the Thai National Vital Event Registration Database using subjects' Population Identification Number. All activities regarding case selection and data collection will be done by well trained clinical research associates (CRAs). The CRAs are from Khon Kaen University where the Statistical Coordinating Center (SCC) for this project is based and are independent of the investigator. Random auditing visits will also be performed by auditors independent of the SCC. These are to ensure not only high quality data but also protecting right and well being of subjects.