Martinez L, Burnett A, Borrego M, Streeter JC, Townsend K, Garcia D. Effect of fondaparinux prophylaxis on anti-factor Xa concentrations in patients with morbid obesity. Am J Health Syst Pharm. 2011 Sep 15;68(18):1716–22. doi: 10.2146/ajhp110010. PMID: 21880887.