 Complete the following phrase:  In the following years, Rickens success was hampered by a series of injuries. He gained his first cap for Germany on 10 September 1997, in a 1998 FIFA World Cup qualifier against Armenia, but missed that major international tournament as well as UEFA Euro 2000. Later, he restored his form, helping Dortmund to claim the league title in 2002 by scoring a career-best six goals and being selected by national coach Rudi Völler for the squad at 