<p><i>Level of Evidence V</i>&#xa0;This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors &#xa0;<a href="http://www.springer.com/00266">www.springer.com/00266</a>.</p>

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Comment on: Application of High-Frequency Ultrasound to Evaluate Forehead Filling Materials

  • Xing Wang,
  • Jia-Ying Xu,
  • Hai-Bin Wang

摘要

Level of Evidence V This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors  www.springer.com/00266.