Re: "Dynamic Risk Stratification for Predicting Recurrence in Patients With Differentiated Thyroid Cancer Treated Without Radioactive Iodine Remnant Ablation Therapy" by Park et al.: (Thyroid 2017;27:524-530).

Th is pa pe r h as b ee n pe er ‐re vie we d an d ac ce pt ed fo r p ub lic at io n, b ut h as ye t t o un de rg o co py ed iti ng an d pr oo f c or re ct io n. Th e f in al pu bl ish ed ve rs io n m ay d iff er fr om th is pr oo f. Dynamic Risk Stratification for Predicting Recurrence in Patients with Differentiated Thyroid Cancer Treated Without Radioactive Iodine Remnant Ablation Therapy: Comment on Data Sparsity Erfan Ayubi, PhD1; Mark J.M. Sullman, PhD2 and Saeid Safiri, PhD3,4,* 1 Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran 2 Department of Psychology, Middle East Technical University, Northern Cyprus Campus, Güzelyurt/Morphou, Northern Cyprus 3 Managerial Epidemiology Research Center, Department of Public Health, School of Nursing and Midwifery, Maragheh University of Medical Sciences, Maragheh, Iran 4 Department of Epidemiology & Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Running title: Comment on data sparsity Word count: 339 *Correspondence: Saeid Safiri, Assistant Professor of Epidemiology, Managerial Epidemiology Research Center, Department of Public Health, School of Nursing and Midwifery, Maragheh University of Medical Sciences, Maragheh, Iran E‐mail: saeidsafiri@gmail.com T hy ro id