Multisite Pacing as a supplemental Treatment of congestive heart failure: Preliminary results of Medtronic Inc. - Gras,D.; Mabo,P.; Tang,T.; Luttikuis,O.; Chatoor,R.; Pedersen,A-K.; Tscheliessnigg,K-H.; Deharo,J-C.; Puglisi,A.; Silvestre,J.; Kimber,S.; Ross,H.; et al. (Insync study PACE, 1998)