1. Peter Diggle is Distinguished University Professor, School of Health and Medicine, Lancaster University, Lancaster, U.K. and Adjunct Professor, Department of Biostatistics, Johns Hopkins University School of Public Health, Baltimore . Yongtao Guan is Associate Professor, Division of Biostatistics, Yale University, New Haven, CT 06520-8034 and is corresponding author. Fauzia Paize is a Research Fellow, Institute of Child Health, University of Liverpool, Alder Hey Children’s NHS Foundation Trust,...