[1] Univ Philippines Manila, Coll Nursing, Manila, Philippines
[2] Cent Philippine Univ, Coll Nursing, Iloilo, Philippines
[3] Univ Philippines Manila, UP Coll Nursing, Technol Transfer & Business Dev Off, Pedro Gil St, Manila 1000, Metro Manila, Philippines
[4] Univ Philippines Manila, Coll Med, Dept Clin Epidemiol, UP Coll Med, Room 103 Paz Mendoza Bldg,547 Pedro Gil St, Manila, Philippines