Robust three-way anova with two between-subjects factors

I've been conducting robust two-way mixed anovas with a between-subjects factor (Group: users vs. nonusers of intervention) and a within-subjects factor (time: baseline vs. one-year follow-up) using the function bwtrim of the WPR2 package.

Is there any way to conduct a three-way mixed anova with two different group variables as between-subjects factors? I know that bwtrim is only desgined for one within- and one between-subjects factor, but is there any other function of the WPR2 package or any other package to do so?

I would be so happy about any recommendations.

Thanks, Josi

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