I was advising a google backed Mobile Healthcare venture afew months ago. The questions I would ask are
1. What's their USP - as there are a number of players across that space already in USA & Europe. I'd gem up your knowledge of the overall mobile health landscape. CBinsights did a useful overview here : https://www.cbinsights.com/blog/iot-healthcare-market-map-company-list/?utm_source=CB+Insights+Newsletter&utm_campaign=d82aa3e59e-Top_Research_Briefs_04_09_2016&utm_medium=email&utm_term=0_9dc0513989-d82aa3e59e-87571845
2. How do they intend to connect healthcare professionals - in different markets major systems are already in place under agreement from the institutions employing these professionals. So how do they legitimately get these healthcare professionals adopting a different system to that provided by their employer ?
3. Not clear from your intro whether this is a pure B2B offering or B2C or B2B2C ?
4. Does the founding team have IP expertise in this area ? I would be looking for previous experience & proven results in health care, marketplaces, SaaS & mobile launches, building mobile traffic etc.
5. Find out more about the founders personal journeys. There was a very useful article in Inc.com about the 7 attributes of outstanding founders. You can find it here : http://www.inc.com/bill-carmody/the-7-attributes-of-exceptional-founders.html
6. What is the burn rate & when are they forecast to be cash positive ? and you want that info to assess how much more funding they are going to need at each stage & whether on the basis on the competition, they are likely to get that funding. Otherwise your funding a Startup that won't get beyond Seed round.
7. Are they clear on what works in their markets ? For example what age groups are they going for & do those age groups prefer Apps or Mobile Internet sites instead ? Usually older age groups prefer mobile internet, not Apps.
8. How do they intend to carry payment across Latin America for transactions ? It's known for being a market with very fragmented payment solutions & some of it's markets have very low card penetration rates.
So I am suggesting you dig abit more into the practicalities of how they intend to capture their own market & how they intend to compete in other markets like Europe, with more established players there.
It might be they can't compete and it's just a Latin America they can realistically capture - if that's the case then they need to be very clear with you on what exactly their exit strategy is for the business.