MP4 : Dr. Jeff Zweerink: What is the significance of this conference?DOC : Dr. Jeff Zweerink: What is the significance of this conference?MP3 : Dr. Jeff Zweerink: What is the significance of this conference?MP4 720p : Dr. Jeff Zweerink: What is the significance of this conference?MP4 480p : Dr. Jeff Zweerink: What is the significance of this conference?