Amazon.com: Symmetric Designs Headmaster Collar - Large Neck Support (12.5cm) : Pet Supplies
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Headmaster Collar - Headmaster Cervical Collar Head Support
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Headmaster Collars - North Coast Medical
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Amazon.com: Symmetric Designs Headmaster Collar - Large Neck Support (12.5cm) : Pet Supplies
Headmaster Collar, Medium - Item #307002
Jack B. Fu, MD on Twitter: "Headmaster cervical collars were used by 62% of Hodgkin lymphoma dropped head syndrome patients for over 6 months. Potentially useful for several hours a day." / Twitter