20. No proteinuria at screening as demonstrated by urine protein: urine creatinine (UPC) ratio of > or equal to 1.0 or urine dipstick for proteinuria > or equal to 2+ (patients discovered to have > or equal to 2+ proteinuria on dipstick urinalysis at baseline should have undergone a 24 hour urine collection and must have demonstrated < or equal to 1g of protein in 24 hours to be eligible).