Some people believe being a middle child can influence your personality, behavior, and even mental health into adulthood. But research is mixed, and other factors may be more important. Share on ...

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3 Department of Sports Medicine, Medical Center Haaglanden, Leidschendam, The Netherlands Correspondence to Dr M H Moen, Rehabilitation and Sports Medicine Department, University Medical Center ...

Correspondence to Dr Kimberly G Harmon, Departments of Family Medicine and Orthopaedics and Sports Medicine, University of Washington, Seattle WA 98195, USA; kharmon{at}uw.edu Sport-related concussion ...