CAMBRIDGE, MA (MARKET WIRE) According to a new PatientsLikeMe® Poll, almost one in three (29%) patients have withheld certain health information from their doctor. Of the 4,364 poll respondents, all of whom are members of PatientsLikeMe's online health data-sharing community (www.patientslikeme.com), nearly half (47%) indicate that they have chosen not to share certain health information with an employer, while 14% have withheld information from insurance companies.