A test of a new intervention or treatment on people for. detecting. -Tolerability. -Safety. -Efficacy. A Clinical trial is defined as a prospective study. comparing the effect and value of intervention. (s) against a control in human beings.
In fact, whether the DVD players play AVI videos or not, it depends on the DVD player model, the AVI video codec or the AVI video resolution/size: 1  Most DVD players only accept MPEG-2 in standard VOBs. 2  Though some newer DVD players can play AVI files, it only plays AVI which is encoded with DivX. However, AVI is a container video format which may encoded with different video codecs like DivX, Xvid, MPEG-4, H.263, WMV, MPEG-1 and etc.
DVD video: This is the most common format used to mass-produce movies and can be played universally on any DVD player. You'll usually see a DVD Video logo somewhere on the DVD case. Unless you have a multi-region DVD player, you will only be able to play DVDs with the same region code as your DVD player. Support is not so universal for the various recordable and rewriteable DVD formats, like DVD+RW. CD: Your DVD player can probably also read compact discs (CDs).