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- Does the index-to-ring finger length ratio (2D:4D) differ in amyotrophic lateral sclerosis (ALS)? Results from an international online case–control studyJane Alana Parkin Kullmann, Roger PamphlettBMJ Open Aug 2017, 7 (8) e016924; DOI: 10.1136/bmjopen-2017-016924
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