>
> (you can have a look at my implementation athttp://www.qimr.edu.au/davidD)
>
> --
> | David Duffy (MBBS PhD)                                         ,-_|\
> | email: dav...@qimr.edu.au  ph: INT+61+7+3362-0217 fax: -0101  /     *
> | Epidemiology Unit, Queensland Institute of Medical Research   \_,-._/
> | 300 Herston Rd, Brisbane, Queensland 4029, Australia  GPG 4D0B994A v