- Correspondence to Elena Piedrahita-Alonso, Departamento de Óptica II (Optometría y Visión), Facultad de Óptica y Optometría, Universidad Complutense de Madrid, Calle Arcos de Jalón 118, CP 28037 Madrid, Spain;
- Received May 8, 2013
- Revised September 6, 2013
- Accepted October 9, 2013
- First published October 29, 2013.
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