PT - JOURNAL ARTICLE ED - , TI - HSOs: Ontario's answer to HMOs? [correction] DP - 1989 Apr 15 TA - Canadian Medical Association Journal PG - 897a--897 VI - 140 IP - 8 4099 - http://www.cmaj.ca/content/140/8/897a.short 4100 - http://www.cmaj.ca/content/140/8/897a.full SO - CMAJ1989 Apr 15; 140