Witzel Ma

Delayed hard palate closure: the philosophy revisited.

Ross Rb, Witzel Ma, Salyer Ke, 1984 .

Velopharyngeal insufficiency after maxillary advancement.

Munro Ir, Witzel Ma, 1977 .

Patterns and location of velopharyngeal valving problems: atypical findings on video nasopharyngoscopy.

Witzel Ma, Posnick Jc, 1989 .