This is the only study of its kind but has promising outcomes for further research.

He described the report as the first systematic study of its kind.

Our recent study of your kind has filled us with envy of those powers.

Indeed, they claim it to be the first study of its kind.

This study sought to minimize a common problem with studies of its kind by repeatedly asking people who were sent questionnaires to return them.

It is believed to be the longest-running study of its kind in the world.

This was the first modern scholarly study of its kind.

This is the most extensive study of its kind (as of January 2011).

It is one of the oldest, largest and most prestigious studies of its kind in the world.

In the largest study of its kind, researchers found no cancer-cannabis connection.