A team of Chicago-based attorneys is leading the appeal of Army Staff Sgt. Robert Bales, who admitted to murdering 16 Afghan civilians in a March 2012 massacre.The attorneys have asked a three-judge panel at the Army Court of Criminal Appeals in Fort Belvoir, Va., to consider whether Bales’ possible exposure to and side effects from an anti-malaria drug, among other things, entitle him to a new sentencing hearing.Bales’ attorneys argue he likely took the controversial anti-malaria drug mefloquine while on tour …