Address: 1Department of Biostatistics, Division of Statistical Genetics, The University of Iowa, Iowa City, Iowa, USA and 2Department of
Mathematics and Statistics, Memorial University of Newfoundland, St. John's, Newfoundland A1C 5S7, Canada
Email: Kai Wang* - kai-wang@uiowa.edu; Yingwei Peng - ypeng@math.mun.ca
* Corresponding author