@article {leachman1969absence,
	title = {Absence of opening click in dehiscence of mitral-valve prosthesis},
	journal = {New England Journal of Medicine},
	volume = {281},
	number = {9},
	year = {1969},
	pages = {461{\textendash}464},
	publisher = {Mass Medical Soc},
	author = {Leachman, Robert D and Cokkinos, Dennis VP}
}
