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APA Citation
Towne, W. D., Patel, R., Cruz, J., Kramer, N., & Chawla, K. K. (1978). effects of gravitational stresses on mitral valve prolapse. I. Changes in auscultatory findings produced by progressive passive head-up tilt.. Heart, 40(5), 482–488. http://access.bl.uk/ark:/81055/vdc_100143574286.0x00003c