PT - JOURNAL ARTICLE AU - Liaw, Fang-Yih AU - Chiang, Chien-Ping TI - Bier spots AID - 10.1503/cmaj.120376 DP - 2012 Jan 01 TA - Canadian Medical Association Journal PG - cmaj.120376 4099 - http://www.cmaj.ca/content/early/2012/09/17/cmaj.120376.short 4100 - http://www.cmaj.ca/content/early/2012/09/17/cmaj.120376.full