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                                    Baseline Characteristics and Barriers to Recruitment in Cardiac and Pulmonary Rehabilitation NIH-Funded Trials  
                                
                                
                                Crystal  Grimshaw MS,Steven J. Keteyian PhD,Roberto  Benzo MD, MS,Joseph  Finkelstein MD, PhD,Daniel E. Forman MD,Diann E. Gaalema PhD,Pamela N. Peterson MD, MSPH,Paula T. Einhorn MD,Antonello  Punturieri MD, PhD,Susan  Shero RN, MS,Jerome L. Fleg MD