<qa>  What is the safety and efficacy of adding nateglinide to treatment withThis study will assess the safety and efficacy of adding nateglinide to treatment with basal insulin glargine, metformin andor thiazolidinedione pioglitazone or rosiglitazone, for patients with type 2 diabetes who are not achieving glycemic control with glargine, metformin andor thiazolidinedione only. 