- Correspondence to Dr Teresa Requena, Subdirección de Análisis de Costes, Servicio Madrileño de Salud, Plaza de Carlos Trías Beltrán n°7, Madrid 28020, Spain;
- Received February 14, 2014
- Revised May 5, 2014
- Accepted May 12, 2014
- First published June 6, 2014.
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