Clinical characteristics of exacerbation-prone adult asthmatics identified by cluster analysis / Mi-Ae Kim, Seung Woo Shin, Jong Sook Park, Soo taek uh, Hun Soo Chang, Da Jeong Bae, YouSook cho, Hae Sim Park, Ho Joo Yoon, Byoung Whui Choi, Young Hoon Kim, Choon Sik Park