Thank you! It's been a combination of 2 things: 1) building tools that make it easier for our hospital partners to scale with us more efficiently, thereby increasing their capacity to send us more patients, and 2) product/marketing.

If you're interested in the growth side of Watsi, we opened up a bunch of our data to Segment earlier this year, and they put out this post about the growth learnings they gathered: https://segment.com/blog/what-we-learned-from-watsis-data/

We also talked with First Round a few months ago about how we use email marketing to grow donations: http://firstround.com/review/what-startups-can-learn-from-wa...

Hopefully we'll be able to share more learnings in the next couple of months!