References:
1Hirschfeld S, Exner G, Luukkaala T, Baer GA. “Mechanical Ventilation or Phrenic Nerve Stimulation for Treatment of Spinal Cord Injury-Induced Respiratory Insufficiency” Spinal Cord; pp 1-5, E-Pub May 2008.
2Shea S, Hoit J. “Speech Production and Speech With a Phrenic Nerve Pacer.” American Journal of Speech-Language Pathology. Vol.5, No.2, pp. 53-60,May 1996.