We use this information to analyze the use of our Sites and to improve Site functionality.</p> <p>We also use cookies. A cookie is a data file that is placed by a website operator on the hard drive of a visitor’s computer to their site. First-party cookies (those placed by Acurian) and third-party cookies (those placed by other parties with whom we work) may be placed on your computer when you visit our Sites for the following purposes: to improve the user experience, including by allowing the Sites to remember you and your preferences as you browse through different pages. to allow us to perform site analytics. and to assess whether visitors to the site later become referrals to clinical trials. One of the ways that we do this is through the use of Google Analytics using data layers listed here. For more information about how Google Analytics uses and processes data, please visit https://www.google.com/policies/privacy/partners/.</p> <p>Acurian and third parties with whom we work may also place cookies and use web beacons on our Sites to collect information about your browsing activity, and use that information to deliver content relevant to your interests, including our advertisements, on our Sites and elsewhere on the internet. We may also use those technologies to understand the usefulness to you of the advertisements and content that has been delivered to you, such as whether you have clicked on an advertisement. If you do not wish to have this information used for the purpose of serving you interest-based ads, you may opt out by clicking here (or if you are located in the European Union click here). Please note this does not opt you out of being served ads. You will continue to receive generic ads.</p> <p>At this time, we do not respond to browser “do not track” signals, however most browsers will allow a visitor to choose which cookies can be placed on his or her computer, and to delete or disable cookies.