PhenX Toolkit https://www.phenxtoolkit.org/index.php - Protocol 1 : Tobacco - 30-Day Quantity and Frequency (Adolescent Protocol) #030801
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Biering-SØrensen F, Krassioukov A, Alexander MS, Donovan W, Karlsson AK, Mueller G, Perkash I, William Sheel A, Wecht J, Schilero GJ.International Spinal Cord Injury Pulmonary Function Basic Data Set. Spinal Cord. 2012 Jun; 50(6):418-21.