BUDAPEST, Feb. 6 (Xinhua) -- The surgery aimed at separating conjoined two-year-old twins from Bangladesh has been a success, official sources announced here on Wednesday.

"The two-and-half-year-old Rabia and Rukia have successfully undergone the implantation of a special Hungarian-designed tissue expander under the guidance of plastic surgeon Gergely Pataki," Semmelweis University said in a statement.

The twins were born on July 16, 2016, in north Bangladesh joined at the head.

"The operation took place on Jan. 25 at Semmelweis University with the collaboration of university staff. The twins are doing well and have already left the clinic," the statement added.

The twins arrived in Budapest on Jan. 5 to undergo a special surgery, the second in a series of three serious interventions.

"The first intervention, separating the different blood vessels, took place in two steps in Bangladesh last February and August," the university explained. "The second intervention was the present plastic surgery," the university said.

"Finally, the third and last operation will be the physical separation of the cranial bones," which will be performed by a team of doctors under the supervision of renowned Hungarian neurosurgeon Dr. Andras Csokay at an as yet undisclosed location.