Source: https://www.researchgate.net/publication/321975434_COMPARATIVE_ECHOCARDIOGRAPHIC_STUDIES_OF_DOGS_WITH_MIXOMATOUS_DEGENERATION_OF_THE_MITRAL_VALVE_DEPENDENT_ON_THE_PRESENCE_OR_ABSENCE_OF_PULMONARY_EDEMA_CONSECUTIVELY_INDEXED_BY_THE_LINEAR_AND_WEIGHT_ID