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If it doesn't exist, then it doesn't need to be defined.

Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Tue, Jul 2, 2013 at 1:21 PM, adams adams <[log in to unmask]> wrote:
 

Hi,

How Can I define condition onset and duration when it doesn't occur in a particular run.

Thank You

Adams