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You can achieve this by adding first a dummy checkbox on the list.
then, add this CSS code on the the form http://www.jotform.com/52752582492361
visibility : hidden !important;
using the Form Designer.
Here is the demo form http://www.jotformpro.com/form/52767206934967
Hope this help. Let us know if you need further assistance.
Thanks for your help.