Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Tsuboshima Kenji and Wakahara Teppei and Matoba Yasumi and Maniwa Yoshimasa,Utility of Kaplan-Meier method and risk classification for recurrence rate of primary spontaneous pneumothorax,The Journal of the Japanese Association for Chest Surgery,0919-0945,The Japanese Association for Chest Surgery,2014,28,4,427-432,https://cir.nii.ac.jp/crid/1390282679337992320,https://doi.org/10.2995/jacsurg.28.427