1. Viral Infections Unit, Department of Vaccination and Immune Protection, National Institute for Health and Welfare (THL), Helsinki, Finland
2. Intestinal Viruses Unit, Department of Infectious Disease Surveillance and Control, National Institute for Health and Welfare (THL), Helsinki, Finland
3. Department of Medical Microbiology and Parasitology, Obafemi Awolowo College of Health Science, Olabisi Onabanjo University, Shagamu, Ogun State, Nigeria
4. Department of Virology, College of Medicine, University of Ibadan, Ibadan, Oyo State, Nigeria