PT - JOURNAL ARTICLE AU - Koppelman, GH AU - Los, H AU - Postma, DS TI - Genetic and environment in asthma: the answer of twin studies AID - 10.1183/09031936.99.13100299 DP - 1999 Jan 01 TA - European Respiratory Journal PG - 2--4 VI - 13 IP - 1 4099 - http://erj.ersjournals.com/content/13/1/2.short 4100 - http://erj.ersjournals.com/content/13/1/2.full SO - Eur Respir J1999 Jan 01; 13