Finally, referral bias remains a concern, since patients referred to a study tend to be more motivated about their health.
The original referred to "a study of mentally retarded children".
Pinault referred to a study suggesting that female employees are more hesitant than male employees to seek advancement.
In Lagos, he often referred to a study by the climatologist James Hansen, which argued that sea levels could rise much faster than previously estimated.
He referred to a study in which a group of people were asked to choose one car from 16 options.
Speaking on a visit to Washington on September 20th, Wang Yi, China's foreign minister, referred to a study of 15 different countries.
You referred to a study that showed British Muslims identify more with their religion than their nationality by comparison with French Muslims.
Corcoran referred to a study by the Stanford Graduate School of Business and the University of California-Santa CrUniversity of California-Santa
The news stories referred to a study published the previous day in the journal Nature Medicine.
