[1]Patent:US5880162,1999,A
[1]Patent:US5998673,1999,A
[2]Patent:US5849958,1998,A
[3]Patent:EP933027,1999,A1
[4]Patent:US6235754,2001,B1
[1]CurrentPatentAssignee:ROCHEHOLDINGAG;PFIZERINC-WO2005/51304,2005,A2Locationinpatent:Page/Pagecolumn129-130