What does the gathering near Washington DC mainly discuss?

(7)This week, over four thousand people from 50 countries have gathered near Washington D. C. to discuss how mobile technology is affecting healthcare. Organizers of the mHealth Summit say some of the biggest advances and initiatives are taking place in low and middle income countries. The 4th annual mHealth Summit brings together experts from the private sector, NGOs, governments and the technology industry. Organizers call it the mHealth ecosystem. Patricia Michael is executive director of the mHealth Alliance, which aims to mainstream the use of mobile technologies to address critical health issues. "In the world, there are six billion mobile phone subscriptions in a population of seven billion people.(8)And the most rapidly growing markets are those in developing countries. Africa, as a continent, you have widespread adoption where three or four years ago the penetration rates were 20 percent or 30 percent and now they’re getting upwards of 60 percent in some countries," she said.