P1005Maximizing CRT Delivery by Using MultipolAr Coronary Sinus Lead FamiLy ACUITY X4: the RALLY X4 study results. (20th June 2017) - Burri, H.; Defaye, P.; Schrage, M.; Morani, G.; Zrenner, B.; Solimene, F.; Hermida, J.; Braun- Dullaeus, C.; Kayser, T.; Biffi, M.