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Schlegl M, Butter C.Schlegl M, et al. Among authors: butter c.Herzschrittmacherther Elektrophysiol. 2006;17 Suppl 1:I42-50. doi: 10.1007/s00399-006-1107-7.Herzschrittmacherther Elektrophysiol. 2006.PMID: 16598621German.
Neuss M, Flach P, Ali T, Butter C.Neuss M, et al. Among authors: butter c.Herzschrittmacherther Elektrophysiol. 2006;17 Suppl 1:I56-62. doi: 10.1007/s00399-006-1109-5.Herzschrittmacherther Elektrophysiol. 2006.PMID: 16598623German.