en: He said there were complex reasons for the increased numbers of cases and scientists were only just beginning to understand the risk factors . However , he said , The reasons behind the increase in incidence are more complex and were just beginning to understand the risk factors .
ms: Katanya, terdapat sebab yang kompleks untuk peningkatan jumlah kes dan saintis hanya mula memahami faktor risiko. Bagaimanapun, katanya, sebab di sebalik peningkatan kejadian itu lebih kompleks dan baru mula memahami faktor risiko.