For instance, studies of this kind have shown the prevalence of mental illness, criminality, delinquencies, prostitution, and drug addiction in urban centers and other highly developed places. 
Lẹ́yìn tó kọ́ ẹ̀kọ́ nípa bí a ti ń ṣe ìwòsàn-minrí, àtàwọnunpers bójú de iwadi ìmòye, ó sì tiraka láti wá sístemú ìmòye tuntun.. 