What are you doing with this research?
And do your keep this private info safe?
It's privacy sensitive if people give up their blood info.
Same question op, what are you doing with this research?
And I checked the link and it only asks for your gender and your bloodtype so I don't think it is that much confidential.
However, OP, from my perspective, the results that you will get in this survey will not be as accurate as you may think because if someone decides to troll, he can spam so much answers.