RT Journal Article SR Electronic T1 Cat litter is a possible trigger for sarcoidosis JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 221 OP 222 DO 10.1183/09031936.00074411 VO 39 IS 1 A1 M. Drent A1 P.A. Wijnen A1 A.W. Boots A1 A. Bast YR 2012 UL http://erj.ersjournals.com/content/39/1/221.abstract AB