Annals of Surger 2018. 267 (1) Barberan-Garcia A, Ubre M, Roca J et al.
Pre-operative Haemoglobin Levels and Iron Status in a Large Multicentre Cohort of Patients Undergoing Major Elective Surgery
M. Muñoz, M. J. Laso-Morales, S. Gómez-Ramírez et al. Anaesthesia 2017, 72, 826–834. http://onlinelibrary.wiley.com/doi/10.1111/anae.13903/full