Factors Influencing the Yield of Progenitor Cells in Bone Marrow Aspiration Concentrate—A Retrospective Analysis of 58 Patients oleh Sathish Muthu, Madhan Jeyaraman, Aditya Narula, V. R. Ravi, Avinash Gandi, Manish Khanna, Nicola Maffulli, Ashim Gupta