WHO estimates that by 2030, there will be a projected shortage of 18 million health workers to achieve the Sustainable Development Goals, mostly in low- and lower-middle-income countries. That figure stood at 7.2 million in November 2013.

More info here:

Health workers: a triple return for health, economic growth, and employment
http://www.who.int/mediacentre/news/notes/2016/health-workers-triple-return/en/

Health workforce needs, demand and shortages to 2030: an overview of forecasted trends in the global health labour market.
http://www.who.int/hrh/com-heeg/Needs_demands_shortages.pdf

The global shortage of health workers?an opportunity to transform care
http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(16)32235-8/fulltext

12 Faces of the Health Workforce Shortage
https://www.intrahealth.org/vital/12-faces-health-workforce-shortage

Nand Wadhwani
The Mother and Child Health and Education Trust | HealthPhone