As part of my PhD I would like to conduct an international online survey of authors of systematic reviews that will take approximately 5 minutes to complete. I wish to incentivise people to take part in the survey in some way. For budget planning, it would be best to make a raffle, as I cannot say exactly how many of the people I invite will participate.

The problem is that gift cards etc. are usually issued in a particular currency and can only be used in the respective countries. For example, Amazon gift cards bought in the American shop and issued in US-Dollar, can only be used in that shop. So, if a person from Africa, Asia, Europe, Oceania or South America won the gift card, it would not be of much use for them as the costs for shipping and customs duty would be fairly high.

What other ways are there to incentivise people from all over the world to take part in a brief online survey?

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