[1] Chulalongkorn Univ, King Chulalongkorn Mem Hosp, Thai Red Cross Soc, Dept Internal Med,Fac Med, Bangkok, Thailand
[2] Rajavithi Hosp, Bangkok, Thailand
[3] Khon Kaen Univ, Fac Med, Mueang Khon Kaen, Thailand
[4] Minist Publ Hlth, Lampang Hosp, Lampang, Thailand
[5] Siriraj Hosp, Bangkok Noi, Thailand
[6] Prince Songkla Univ, Hat Yai, Thailand
[7] Phrapokklao Hosp, Phrapokklao Canc Ctr Excellence, Chanthaburi, Thailand
[8] Mahidol Univ, Ramathibodi Hosp, Ratchathewi, Thailand
[9] King Chulalongkorn Mem Hosp, Bangkok, Thailand
[10] Srinakharinwirot Univ, Fac Med, Dept Internal Med, Nakhon Nayok, Thailand
[11] Chiang Mai Univ, Mueang Chiang Mai, Thailand
[12] Phramongkutklao Coll Med, Bangkok, Thailand
[13] Udon Thani Hosp, Udon Thani, Thailand
[14] Queen Savang Vadhana Mem Hosp, Si Racha, Thailand
[15] Minist Publ Hlth, Sakon Nakhon Hosp, Bangkok, Thailand
[16] Mahidol Univ, Fac Med, Dept Med, Div Med Oncol,Siriraj Hosp, Bangkok, Thailand
[17] Ramathibodi Hosp, Dept Med, Fac Med, Ratchathewi, Thailand