Areas of Expertise
MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.
Learn more about MediFind’s expert tiers
Find Mr. Johnston's expertise for a condition
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- Elite
- AsthmaMr. Johnston isElite. Learn about Asthma.
- Common ColdMr. Johnston isElite. Learn about Common Cold.
- Distinguished
- Chronic Obstructive Pulmonary Disease (COPD)Mr. Johnston isDistinguished. Learn about Chronic Obstructive Pulmonary Disease (COPD).
- Advanced
- BronchitisMr. Johnston isAdvanced. Learn about Bronchitis.
- COVID-19Mr. Johnston isAdvanced. Learn about COVID-19.
- ParainfluenzaMr. Johnston isAdvanced. Learn about Parainfluenza.
- PneumoniaMr. Johnston isAdvanced. Learn about Pneumonia.
- StridorMr. Johnston isAdvanced. Learn about Stridor.
- Experienced
- Allergic RhinitisMr. Johnston isExperienced. Learn about Allergic Rhinitis.
- ArthritisMr. Johnston isExperienced. Learn about Arthritis.
- Chronic Rhinosinusitis with Nasal Polyps (CRSwNP)
- Cystic FibrosisMr. Johnston isExperienced. Learn about Cystic Fibrosis.
- EndoscopyMr. Johnston isExperienced. Learn about Endoscopy.
- FluMr. Johnston isExperienced. Learn about Flu.
- GastrectomyMr. Johnston isExperienced. Learn about Gastrectomy.
- H1N1 InfluenzaMr. Johnston isExperienced. Learn about H1N1 Influenza.
- HIV/AIDSMr. Johnston isExperienced. Learn about HIV/AIDS.
- HysterectomyMr. Johnston isExperienced. Learn about Hysterectomy.
- MastectomyMr. Johnston isExperienced. Learn about Mastectomy.
- Nasal PolypsMr. Johnston isExperienced. Learn about Nasal Polyps.
- ObesityMr. Johnston isExperienced. Learn about Obesity.
- Premature InfantMr. Johnston isExperienced. Learn about Premature Infant.
- Rheumatoid Arthritis (RA)Mr. Johnston isExperienced. Learn about Rheumatoid Arthritis (RA).
- Severe Acute Respiratory Syndrome (SARS)Mr. Johnston isExperienced. Learn about Severe Acute Respiratory Syndrome (SARS).
- SinusitisMr. Johnston isExperienced. Learn about Sinusitis.
- Sleeve GastrectomyMr. Johnston isExperienced. Learn about Sleeve Gastrectomy.
View All 18 Experienced Conditions
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