RT Journal Article SR Electronic T1 Role of viral infections in the inception of asthma and allergies during childhood: could they be protective? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1189 OP 1191 DO 10.1136/thx.49.12.1189 VO 49 IS 12 A1 F D Martinez YR 1994 UL http://thorax.bmj.com/content/49/12/1189.abstract AB