'email invitations' is correct and usable in written English.
You can use it to refer to invitations sent by email. For example, "We sent out email invitations to all of our guests."
Emergency physicians and residents were invited to participate in the study by email invitations sent by a research coordinator.
The email invitations containing the link to the questionnaire also invited the students to participate in the focus groups.
But the widespread use of email invitations goes too far, the plaintiffs said.
Email invitations or download them for free from websites such as Netmums.
If you opt out [of emails from Facebook], you will NOT receive these email invitations and notifications from your friends".
Email invitations were sent using relevant membership directories and conference lists.
Regarding the selection bias, we found that email invitations can improve the representativeness of reviews by adding a new segment of verified buyers.
Email invitations were sent from the research team, a faculty member in each department, and through peer leaders of the SWE Society for Women Engineerss) organization.
Note that also web surveys that are based on email invitations from a large database (panel) of respondents are volunteer surveys.
"You will not tag users or send email invitations to non-users without their consent".
We propose that one way to reduce these biases is to send email invitations to write a review to a random sample of buyers, and not exposing them to existing reviews while they write their reviews.
