Bauer M, Kang L, Qiu Y, Wu J, Peng M, Chen HH, Camci-Unal G, Bayomy AF, Sosnovik DE, Khademhosseini A, Liao R. Adult cardiac progenitor cell aggregates exhibit survival benefit both in vitro and in vivo. PLoS One. 2012; 7(11):e50491.