I'm not entirely sure, but perhaps you could ask "the National Child Development Study in the United Kingdom and the National Longitudinal Study of Adolescent H

I'm not entirely sure, but perhaps you could ask "the National Child Development Study in the United Kingdom and the National Longitudinal Study of Adolescent Health in the United States". You may doubt it, but their study indicates otherwise. Now there may be problems with their paper, but random "doubts" aren't them.