Good day.
I will be glad to help you dream come true concerning your healthcare app using phonegap.
I have used phonegap to develop two apps before.
The first one is an app for taking daily work reports of each staff in an organization. It was built with firebase.
The second one is an app for a estate management. The features ranges from a customer relational management, to accounting, staffs, and some notes, tasks, to do list etc.
The database used was mysql.
I will be glad to work with you on your health care app.
The number of days the project will take depends on the features of the app.
I will be looking forward to hearing from you.
Thanks.