Response to Gargi S Sarode, Sachin C Sarode, and Rahul Anand’s Letter to the Editor of Radiotherapy and Oncology regarding the paper titled “Impact on xerostomia for nasopharyngeal carcinoma patients treated with superficial parotid lobe-sparing intensity-modulated radiation therapy (SPLS-IMRT): A prospective phase II randomized controlled study.” by Huang et al.