Incorrect measurements and misleading conclusions in the article “Comparison of the efficacy of tooth alignment among lingual and labial brackets: an in vitro study” by Dirk Wiechmann, Hans-Peter Bantleon, Birte Melsen, Björn Zachrisson, Urban Hägg, Pierre Canal, Robert Garcia, Stephane Barthélemi, Laure Frapier, Dan Grauer, Christian Sander, Peter Diedrich, Collin Jacobs, Heiner Wehrbein, Ariane Hohoff, Hans-Joachim Helms, Rainer Schwestka-Polly

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