Gender: There were 20 females in the studied participants that accounted for 28.6%, and 50 males that accounted for 71.4%; the male / female ratio was 2.5/1.
Nhóm nghiên cứu có 20 nữ chiếm tỷ lệ 28,6% và 50 nam chiếm 71,4%; tỷ lệ nam / nữ là 2, 5/1.