Nicholas G Castle Departamento de Política y Administración Sanitaria, Universidad de Pittsburgh, Pittsburgh, Pensilvania, Estados Unidos. Contacto: Graduate School of Public Health, University of Pittsburgh, A610 Crabtree Hall, Pittsburgh 15261, Pennsylvania, USA; [CastleN@Pitt.edu] Comentario sobre: Spilsbury K, Hewitt C, Stirk L y cols. The relationship between nurse staffing and quality of care in nursing homes: a systematic review. Int J Nurs Stud 2011; 48: 732?50 [[CrossRef]][[Medline]]. Implicaciones para la práctica y la investigación ...