This as-told-to essay is based on a conversation with Dr. Haley Abivardi, DMD (above, right), and Dr. Goly Abivardi, DMD, the 56- and 52-year-old co-CEOs and founders of vVardis, based in Zug and Zurich. It’s been edited for length and clarity.We’re sisters and best friends who founded vVardis, a healthcare…