Read the following statements
(I) The side-effects of the use of anabolic steroids in females include masculinisation (features like males), increased aggressiveness, mood swings, depression, abnormal menstrual cycles.
(II) Adolescence means both 'a period' and 'a process' during which a child becomes mature in terms of his/her attitudes and beliefs for effective participation in society.
(III) Barbiturates are the drugs which are normally used as medicines to help patients cope with mental illnesses like depression and insomnia.
(IV) To help destroy the tumor, patients are treated with biological response modifiers like -interferon, which boost their immune system.
How many of the above statements is/are incorrect?