 Professor Chris Hammond oo ka tirsan jaamacadda Kings College London ayaa yiri Aragti gaabnida waxa ay gaaraysaa heer xad ka bax ah adduunka, dalalka Singapore, Taiwan iyo Kuuriyada Koonfureed, waxa ay gaareen dadka qaba aragtida gaaban boqolkiiba 90, gaar ahaan dadka dadoodu tahay 18 jir. 