Supplementary material: Keywords for each research question Key words For research question “What are the definitions of conditions related to salivary gland dysfunction and xerostomia, such as xerostomia, dry mouth, hyposalivation, sialorrhea, etc.?”: Xerostomia/Hyposalivation/Reduced saliva flow/Reduced saliva secretion/Salivary gland dysfunction/Hypersalivation/Sialorrhea/Increased salivation/Increased saliva flow/Salivary gland degeneration/Salivary gland hypertrophy AND Burning mouth, Stomatodynia, Dysphagia, Odynophagia, Altered taste, Dysgeusia, Mucositis, Indigestion, Sialosis, Sialadenosis, Hypertension, Liver cirrhosis, Mucosal wetness, Ptyalism, Drooling, Mucosal wetness, Aplasia of salivary glands, Ectodermal dysplasia. For research question “Which are the accepted/validated methods for assessing salivary gland dysfunction?”: Salivary glands/Saliva/Xerostomia/Dry mouth/Hyposalivation AND Diagnostic techniques and procedures, Sialometry, Saliva collection, Periotron, Salivary gland biopsy, Salivary gland histopathology, Salivary scintigraphy, Sialography, Sialochemistry, Stenson’s duct, Wharton’s duct, Stimulated saliva, Unstimulated saliva, Salivary flow rate, Salivary dysfunction, Salivary gland palpation. Salivary gland dysfunction/Dry mouth/Xerostomia/Hyposalivation AND Oral health, Impact on oral health; Salivary gland dysfunction/ Dry mouth/ Xerostomia/Hyposalivation AND Nordic Orofacial Test-Screening, Quality of life, Oral health impact profile, Oral impact on daily performances, Geriatric oral health assessment index, DMFT, Community periodontal index, Plaque index, Gingivitis index, Candida colonies, Caries, Decayed teeth, Oral mucositis, Oral infection, Glossitis. Dry mouth/ Xerostomia/Decreased salivary flow/Burning mouth/Hyposalivation/Drooling AND Visual analogue scale, Questionnaire, Oral symptoms, Diagnostic tools, Dysphagia, Burning mouth, Stomatodynia, Dysgeusia, Altered taste, Oral irritation, Oral burning. For research question “What epidemiological data exist regarding MISGD and medication-induced xerostomia and its societal costs?”: Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia/Hyposalivation AND Epidemiology, Prevalence, Incidence, Reduced salivary flow, Alteration of saliva components/Alteration of saliva biomarkers/Alteration of saliva electrolytes/Peptides/Proteins. Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia /Hyposalivation AND costs, Direct costs, Cost effectiveness, Indirect costs, Economic impact, Economics, Illness cost, Disease cost, Disease burden, Healthcare usage, Outpatient cost, Cost utility, Dry mouth palliative treatment, Hyposalivation treatment. For research question “Which management measures of MISGD and its oral sequelae have been described and what is their efficacy?”: Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia/Hyposalivation AND Prevention, Amifostine, Fluoride, Monopharmacy, Acupuncture. Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia/Hyposalivation AND Prevention, Prevention of adverse effects, Amifostine, Efficiency, Oral Health, Efficacy of preventive measures, Relief, Benefit of treatment, Fluoride. Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia/Hyposalivation/Reduced salivary flow AND Saliva substitutes, Artificial saliva, Oral lubricants, Lactoperoxidase, Lysozyme, Lactoferrin, Topical treatment, Fluoride, Xylitol, Antifungal, Antibiotic, Anti-inflammatory/ Sialogogue, Pilocarpine, Cevimeline, Chewing gum. Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia/Hyposalivation, reduced salivary flow AND Efficacy/Saliva substitutes, Artificial saliva, Oral lubricants, Lactoperoxidase, Lysozyme, Lactoferrin, Fluoride, Xylitol, Antifungal, Antibiotic, Anti-inflammatory, Sialogogue, Pilocarpine, Cevimeline. Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia/Hyposalivation AND Prevention, Amifostine, Topical fluorides, Xylitol gum, Biotene gel, Mouth rinse, Preventive measures. Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia/ Hyposalivation AND Efficacy of/ Preventive measures, Caries prevention, Fluorides, Oral hygiene, Pilocarpine, Cevimeline, Xylitol gum, Antifungal agents, Antibacterial agents. 3 Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia/ Hyposalivation AND Saliva substitutes, Artificial saliva, Oral lubricants, Lactoperoxidase, Lysozyme, Lactoferrin, Antifungal, Antibiotic, Antiinflammatory, Analgesic, Antiseptic rinse, Fluoride, Xylitol gum, Sialogogue, Biotène, Pilocarpine, Cevimeline, Chewing gum. Medication/Drugs AND Salivary glands/Saliva/Dry mouth/Xerostomia/Hyposalivation AND Efficacy of/ Effectiveness of/ Saliva substitutes, Artificial saliva, Oral lubricants, Lactoperoxidase, Lysozyme, Lactoferrin, Antifungal, Antibiotic, Anti-inflammatory, Analgesic, Antiseptic rinse, Fluoride, Xylitol gum, Sialogogue, Biotene, Fluoride, Pilocarpine, Cevimeline. For research question “Which diagnostic and/or preventive and/or therapeutic/attenuating methods of MISGD are under research/development?”: Medication/Drugs AND Salivary glands/Saliva/Xerostomia/Dry mouth/Hyposalivation AND Diagnostic techniques and procedures, Diagnostic methods, Saliva proteomics, Biomarkers, Screening, New methods, Electrostimulation. Medication/Drugs AND Salivary glands/Saliva/Xerostomia/Dry mouth/Hyposalivation AND Prevention, New research, Chewing gum. Medication/Drugs AND Salivary glands/Saliva/Xerostomia/Dry mouth/Hyposalivation AND Treatment techniques and procedures, Therapeutic method, Palliative treatment, Relief of symptoms, Mouthrinse formulation, Acupuncture, Electrostimulation, Saliva substitute, Chewing gum. Medication/Drugs AND Salivary glands/Saliva/Xerostomia/Dry mouth/Hyposalivation/Drooling/Hypersalivation AND Therapy, Treatment, Management, Management strategies, Trial, Palliative treatment, Symptom relief, Flow rate stimulation; Relief of AND Drooling, Xerostomia, Hyposalivation, Hypersalivation, Dysphagia, Burning mouth, Stomatodynia Dysgeusia, Altered taste, Oral irritation, Oral burning, Dry mouth, Decreased saliva flow, Stomatodynia, Oral mucositis, Altered taste, Dysgeusia, Dysphagia, Odynophagia, Sialorrhea. 4