Clinical correlation of serum zinc and chromium levels in patients with type 2 diabetes mellitus and complications in Pakistan: a retrospective study 1Department of Biomedicine/Atta Ur Rehman School of Applied Biosciences, National University of Science and Technology, Islamabad, Punjab, Pakistan 2NUST School of Health Sciences, National University of Science and Technology, Islamabad, Punjab, Pakistan DOI 10.7717/peerj.20184 Academic Editor Sonia Oliveira Subject Areas Food Science and...