1409-3871 1409-3871 S1409-38712020000200217 10.15517/lank.v20i2.43211 Philippines Philippines Philippines 00 08 2020 00 08 2020 20 2 217 220

2016 Second 184 2011 289 2007 359 2020 2018 7 9 9 2415-7 2011 1907 13 52 52 2018 374 3 3 249-56