The study was conducted by the University of California, Los Angeles. The study was based on a survey of 1.9 billion people, or about 24% of the world's population.

The number of people in the study is expected to reach 2.2 billion by 2030, and 3.1 billion by 2050. It is the first time the study has been conducted in the U.S. and the second time it has been done in the UK. The winner will be announced at the end of the study.