Comment on

• User evaluation of two electronic mobility aids for persons who are visually impaired: a quasi-experimental study using a standardized mobility course.

  Roentgen UR, Gelderblom GJ, de Witte LP. Roentgen UR, et al. Assist Technol. 2012 Summer;24(2):110-20; quiz 121-2. doi: 10.1080/10400435.2012.659794. Assist Technol. 2012. PMID: 22876733
• Methodology issues and misleading information in: "User evaluation of two electronic mobility aids for persons who are visually impaired: a quasi-experimental study using a standardized mobility course," by Roentgen, Gelderblom, and de Witte, Assistive Technology, Volume 24, Issue 2, pp. 110-120.

  Hoyle BS. Hoyle BS. Assist Technol. 2013 Spring;25(1):58-9. doi: 10.1080/10400435.2013.759447. Assist Technol. 2013. PMID: 23527432 No abstract available.