RT Journal Article SR Electronic T1 Amoxycillin did not improve the clinical course of acute maxillary sinusitis in primary care JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 152 OP 152 DO 10.1136/ebm.1997.2.152 VO 2 IS 5 YR 1997 UL http://ebm.bmj.com/content/2/5/152.abstract AB