 Complete the following phrase:  In 2004, Kostitsyn had also made his senior international debut as a 19-year-old at the 2004 IIHF World Championship. He scored six points in five games. The following year in 2005 IIHF World Championship, however, he did not record a point in six games playing in the top division. Following his rookie season in the American Hockey League AHL in 2006, he played in his 