PT - JOURNAL ARTICLE AU - David Helwig TI - Censoring breast cancer in San Francisco DP - 2000 May 02 TA - Canadian Medical Association Journal PG - 1338--1338-a VI - 162 IP - 9 4099 - http://www.cmaj.ca/content/162/9/1338.2.short 4100 - http://www.cmaj.ca/content/162/9/1338.2.full SO - CMAJ2000 May 02; 162