title: A reply.
authors.affiliation: Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands. luc.tielens@radboudumc.nl.
authors.forename: L K P
authors.initials: LK
authors.lastname: Tielens
mesh_terms: D000818:Animals; D006801:Humans; D009407:Nerve Block / Q000379:methods*; D018084:Ultrasonography, Interventional / Q000379:methods*