68 Views | 44 Downloads
Correspondence: H. Anton-Culver, Department of Epidemiology, School of Medicine, 224 Irvine Hall University of California, Irvine, CA 92697-7550, USA., hantoncu@uci.edu
Author contributions: All authors have contributed to this manuscript with different levels depending on their expertise. However all authors have participated in the data collection, design and writing of the manuscript.
None declared
© 2016 Elsevier Ltd. All rights reserved.