 Abashakashatsi bo kuri Kaminuza ya London School of Hygiene and Tropical Medicine bavuga ko nubwo ku bafite munsi yimyaka 25 yamavuko nabakiri ingaragu bafite amahirwe macye yo gukora imibonano mpuzabitsina, aho byagabanutse cyane ari mu bakuru no mu bashyingiranywe. 