सासे आमेरिकायारिनि बिजिरथिया बोसोन - होयोदि तलबुतेमाइडा बेरामखौ होबथानो फेलें - जाबाय आरो बेखौ गाज्रिसिनसो खालामबाय ।
An American study suggests that tolbutamide has failed to prevent the disease and even made it worse .