MOESM2 of Effectiveness of music therapy for alleviating pain during haemodialysis access cannulation for patients undergoing haemodialysis: a multi-facility, single-blind, randomised controlled trial KishidaMasatsugu YamadaYosuke InayamaEmi KitamuraMineaki NishinoTomoya OtaKeiko ShintaniAyumi IkenoueTatsuyoshi 2019 Additional file 2. Monte Carlo simulation study for selecting an optimal statistical test.