Subjects were randomized to a combination of empagliflozin @ mg/linagliptin @ mg ( n = @ ) , empagliflozin @ mg/linagliptin @ mg ( n = @ ) , empagliflozin @ mg ( n = @ ) , empagliflozin @ mg ( n = @ ) , or linagliptin @ mg ( n = @ ) as add-on to metformin for @ weeks .