RT Journal Article SR Electronic T1 Interferon-γ release assays in tuberculosis contacts: is there a window period? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 215 OP 217 DO 10.1183/09031936.00030610 VO 37 IS 1 A1 L. Anibarro A1 M. Trigo A1 C. Villaverde A1 A. Pena A1 S. Cortizo A1 D. Sande A1 R.A. Pazos A1 Á. González-Fernández YR 2011 UL http://erj.ersjournals.com/content/37/1/215.abstract AB