[1] CHU Vaudois, 82 Ave Provence, CH-1007 Lausanne, Switzerland
[2] Univ Lausanne, Inst Humanites Med, 82 Ave Provence, CH-1007 Lausanne, Switzerland
[3] Univ Paris, Hop Univ Necker Enfants Malad, AP HP, Unite Douleur & Med Palliat Perinatale Pediat Adu, 149 Rue Sevres, F-75015 Paris, France
[4] Univ Sorbonne Paris Nord, Hop Univ Avicenne, AP HP, Serv Anesthesie Reanimat, 125 Rue Stalingrad, F-93000 Bobigny, France