inclusion criteria: subjects must meet all the of following criteria to be included in this study: * men residing in dormitory aged 21-60 years * willing and able to give informed consent * able to understand instructions and consume study medications according to the study protocol. * weight more than 40kg * owns a mobile phone (with wireless fidelity and/or 3g connection and able to fill in online forms.

inclusion criteria: subjects must meet all the of following criteria to be included in this study: * men residing in dormitory aged 21-60 years * willing and able to give informed consent * able to understand instructions and consume study medications according to the study protocol. * weight more than 40kg * owns a mobile phone (with wireless fidelity and/or 3g connection and able to fill in online forms.

inclusion criteria: subjects must meet all the of following criteria to be included in this study: - men residing in dormitory aged 21-60 years - willing and able to give informed consent - able to understand instructions and consume study medications according to the study protocol. - weight more than 40kg - owns a mobile phone (with wireless fidelity and/or 3g connection and able to fill in online forms.

inclusion criteria: subjects must meet all the of following criteria to be included in this study: - men residing in dormitory aged 21-60 years - willing and able to give informed consent - able to understand instructions and consume study medications according to the study protocol. - weight more than 40kg - owns a mobile phone (with wireless fidelity and/or 3g connection and able to fill in online forms.