"mHealth can be defined as medical and public health practices supported by mobile technologies, such as mobile phones, patient monitoring devices, tablets, personal digital assistants (PDAs), and other wireless devices," Patricia Mechael, executive director of the mHealth Alliance, and Sarah Struble, a program associate at the mHealth Alliance, write in an Al Jazeera opinion piece. "Patients, providers, health administrators, and public health advocates can all use mHealth to strengthen health systems by improving health services and expanding their reach," they continue, adding, "There are several opportunities for mHealth to transform health care systems, particularly in developing countries, where public health information and access to health services are severely limited by the lack of facilities, trained personnel, and supplies."