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I know that it's difficult to understand, because of the medical terminologies. Did you watch the video? It's helpful!
Thank you for your comment and your resteem!

well actually I wanted to watch the video but the link is broken I think cause there's no video notification. :)

It's working! If you select it, a message appears. (Watch this video in youtube). If you tap it you can watch the video. You can also tap the green phrase under the video and it transfer you there!