Sonia Gandhi New Delhi - Arabstoday     Nearly six months after undergoing a surgery abroad, Congress president Sonia Gandhi has travelled out of the country for a \"routine check up\" in connection with the treatment for her undisclosed illness. \"Congress president Sonia Gandhi has travelled abroad for routine check up after six months of her earlier treatment,\" AICC general secretary Janardan Dwivedi said here yesterday. He said Gandhi, 65, would return in four to five days. Party sources said that Gandhi left for a foreign destination on Monday night without disclosing the nature of the check up.