 Complete the following phrase:  The Tour had six events for 2018, five in Europe and one in the United States, leading to the 2018 IAAF World Indoor Championships in Birmingham, United Kingdom. Winners of the Tour enjoyed similar privileges in relation to World Indoor Championships qualification as Diamond League winners do in relation to World Championships in Athletics. This was the first edition of the tour that featured the Madrid Indoor Meeting. The five 2017 meetings returned, although the Birmingham Indoor Grand Prix once more, as in 2016, moved to Glasgow as part of a long term deal, accommodating the hosting of the 