Sinoatrial BlockNeckLymph NodesSick Sinus SyndromeArrhythmia, SinusNeck DissectionLymphatic MetastasisPacemaker, ArtificialSinoatrial NodeCardiac Pacing, ArtificialHeart BlockCarcinoma, Squamous CellAtrial FibrillationFollow-Up StudiesLymph Node ExcisionSentinel Lymph Node BiopsyAtrioventricular NodeRanvier's NodesAxillaNeoplasm StagingTuberculosis, Lymph NodeLymphatic DiseasesBreast NeoplasmsPrognosisMediastinumMesentery