- Macular Degeneration 390 studies
- Macular Edema 157 studies
- Malabsorption Syndromes 45 studies
- Malaria 319 studies
- Malaria, Cerebral 8 studies
- Malaria, Falciparum 146 studies
- Malaria, Vivax 13 studies
- Malformations of Cortical Development 13 studies
- Malignant astrocytoma 7 studies
- Malignant Carcinoid Syndrome 33 studies
- Malignant fibrous histiocytoma 41 studies
- Malignant germ cell tumor 42 studies
- Malignant Hyperthermia 1 study
- Malignant mesenchymal tumor 612 studies
- Malignant mixed Mullerian tumor 4 studies
- Malnutrition 257 studies
- Malocclusion 7 studies
- Malocclusion, Angle Class II 1 study
- Malocclusion, Angle Class III 1 study
- Mandibular Injuries 1 study
- Mannosidase Deficiency Diseases 5 studies
- Mansonelliasis 3 studies
- Mantle cell lymphoma 593 studies
- Marburg hemorrhagic fever 1 study
- Marburg Virus Disease 1 study
- Marchiafava-Micheli disease 20 studies
- Marfan Syndrome 9 studies
- Marijuana Abuse 50 studies
- Marijuana Smoking 11 studies
- Mast cell disease 21 studies
- Mastitis 4 studies
- Mastocytoma 21 studies
- Mastocytosis 21 studies
- Mastocytosis, Cutaneous 2 studies
- Mastocytosis, Systemic 11 studies
- Mastoiditis 2 studies
- MAT deficiency 1 study
- Maxillary Diseases 1 study
- Maxillary Sinusitis 7 studies
- Maxillofacial Abnormalities 16 studies
- Maxillofacial Injuries 4 studies
- McCune Albright syndrome 11 studies
- Measles 59 studies
- Meconium Aspiration Syndrome 7 studies
- Mediastinal Diseases 7 studies
- Mediastinal Neoplasms 3 studies
- Mediastinitis 3 studies
- Medulloblastoma 146 studies
- Melanoma 718 studies
- Melanoma of the choroid 54 studies
- Melanoma, familial 29 studies
- Melanosis 17 studies
- MELAS Syndrome 2 studies
- Melioidosis 1 study
- Membranoproliferative glomerulonephritis (type 2) 1 study
- Membranous nephropathy, idiopathic 7 studies
- Memory Disorders 48 studies
- Meniere Disease 4 studies
- Meningeal Neoplasms 31 studies
- Meningioma 95 studies
- Meningitis 112 studies
- Meningitis, Bacterial 30 studies
- Meningitis, Cryptococcal 20 studies
- Meningitis, Haemophilus 3 studies
- Meningitis, Meningococcal 30 studies
- Meningitis, Pneumococcal 2 studies
- Meningocele 3 studies
- Meningococcal Infections 86 studies
- Meningococcemia 3 studies
- Meningomyelocele 4 studies
- Menkes Kinky Hair Syndrome 1 study
- Menkes syndrome 1 study
- Menopause 321 studies
- Menopause, Premature 8 studies
- Menorrhagia 33 studies
- Menstruation Disturbances 96 studies
- Mental Disorders 5788 studies
- Mental Disorders Diagnosed in Childhood 526 studies
- Mental Fatigue 2 studies
- Mental Retardation 109 studies
- Mercury Poisoning 1 study
- Merkel cell cancer 6 studies
- Mesothelioma 119 studies
- Metabolic Diseases 4048 studies
- Metabolic disorder 4048 studies
- Metabolic Syndrome X 95 studies
- Metabolism, Inborn Errors 437 studies
- Metachromatic leukodystrophy 10 studies
- Metaplasia 148 studies
- Metastatic squamous neck cancer with occult primary 110 studies
- Methylmalonic acidemia 1 study
- Metrorrhagia 21 studies
- Mevalonate Kinase Deficiency 1 study
- Mevalonic aciduria 1 study
- Microcephaly 2 studies
- Microencephaly 2 studies
- Microphthalmia 3 studies
- Microphthalmos 3 studies
- Microsatellite Instability 4 studies
- Microscopic polyangiitis 16 studies
- Microsporidiosis 1 study
- Microvascular Angina 5 studies
- Migraine Disorders 208 studies
- Migraine with Aura 22 studies
- Migraine without Aura 19 studies
- Milk Hypersensitivity 11 studies
- Mineralocorticoid Excess Syndrome, Apparent 1 study
- Miosis 3 studies
- Mitochondrial Diseases 19 studies
- Mitochondrial Myopathies 4 studies
- Mitochondrial trifunctional protein deficiency 1 study
- Mitral Valve Insufficiency 33 studies
- Mitral Valve Prolapse 17 studies
- Mitral Valve Stenosis 4 studies
- Mixed Connective Tissue Disease 4 studies
- Mixed Tumor, Mullerian 3 studies
- Miyoshi myopathy 1 study
- Mobility Limitation 7 studies
- Molluscum Contagiosum 1 study
- Mondini Dysplasia 1 study
- Monkeypox 2 studies
- Monoclonal gammopathy of undetermined significance 59 studies
- Mononeuropathies 45 studies
- Monosomy 3 studies
- Monosomy X 30 studies
- Mood Disorders 1470 studies
- Morphine Dependence 2 studies
- Morquio syndrome 1 study
- Motion Sickness 2 studies
- Motor neuro-ophthalmic disorders 42 studies
- Motor Neuron Disease 152 studies
- Motor neuropathy 6 studies
- Motor Skills Disorders 1 study
- Mouth Diseases 391 studies
- Mouth Neoplasms 81 studies
- Mouth, Edentulous 16 studies
- Movement Disorders 686 studies
- Moyamoya Disease 1 study
- Moyamoya disease 1 1 study
- Muckle-Wells syndrome 5 studies
- Mucocutaneous Lymph Node Syndrome 9 studies
- Mucolipidoses 4 studies
- Mucopolysaccharidoses 29 studies
- Mucopolysaccharidosis I 19 studies
- Mucopolysaccharidosis II 6 studies
- Mucopolysaccharidosis IV 1 study
- Mucopolysaccharidosis type 6 4 studies
- Mucopolysaccharidosis VI 9 studies
- Mucopolysaccharidosis VII 1 study
- Mucormycosis 2 studies
- Mucositis 82 studies
- Muenke Syndrome 1 study
- Multi-centric Castleman’s Disease 5 studies
- Multicystic Dysplastic Kidney 1 study
- Multifocal choroiditis 2 studies
- Multiple Chemical Sensitivity 1 study
- Multiple Endocrine Neoplasia 10 studies
- Multiple hereditary exostoses 3 studies
- Multiple Myeloma 864 studies
- Multiple Organ Failure 19 studies
- Multiple Sclerosis 335 studies
- Multiple Sclerosis, Chronic Progressive 16 studies
- Multiple Sclerosis, Relapsing-Remitting 104 studies
- Multiple System Atrophy 23 studies
- Multiple system atrophy (MSA) with orthostatic hypotension 7 studies
- Multiple Trauma 13 studies
- Mumps 40 studies
- Muscle Cramp 23 studies
- Muscle Hypertonia 50 studies
- Muscle Hypotonia 8 studies
- Muscle Rigidity 18 studies
- Muscle Spasticity 69 studies
- Muscle Weakness 28 studies
- Muscular Atrophy 38 studies
- Muscular Atrophy, Spinal 19 studies
- Muscular Diseases 392 studies
- Muscular Disorders, Atrophic 53 studies
- Muscular Dystrophies 47 studies
- Muscular Dystrophies, Limb-Girdle 4 studies
- Muscular Dystrophy, Duchenne 26 studies
- Muscular dystrophy, Duchenne and Becker type 25 studies
- Muscular Dystrophy, Facioscapulohumeral 4 studies
- Muscular Dystrophy, Oculopharyngeal 1 study
- Musculoskeletal Abnormalities 57 studies
- Musculoskeletal Diseases 2710 studies
- Mutism 3 studies
- Myalgic encephalomyelitis 19 studies
- Myasthenia Gravis 14 studies
- Myasthenic Syndromes, Congenital 1 study
- Mycobacterium avium complex infection 44 studies
- Mycobacterium avium-intracellulare Infection 44 studies
- Mycobacterium Infections 282 studies
- Mycobacterium Infections, Atypical 50 studies
- Mycoplasma Infections 8 studies
- Mycoplasmal pneumonia 5 studies
- Mycoses 621 studies
- Mycosis Fungoides 295 studies
- Mydriasis 7 studies
- Myelitis 56 studies
- Myelitis, Transverse 6 studies
- Myelodysplasia 757 studies
- Myelodysplastic Syndromes 757 studies
- Myelodysplastic-Myeloproliferative Diseases 217 studies
- Myelofibrosis 235 studies
- Myelofibrosis-osteosclerosis 27 studies
- Myeloid Metaplasia 27 studies
- Myeloproliferative Disorders 703 studies
- Myocardial Infarction 538 studies
- Myocardial Ischemia 1722 studies
- Myocardial Reperfusion Injury 3 studies
- Myocardial Stunning 3 studies
- Myocarditis 6 studies
- Myoclonic Epilepsies, Progressive 5 studies
- Myoclonus 14 studies
- Myoclonus epilepsy 8 studies
- Myofascial Pain Syndromes 172 studies
- Myofibroma 61 studies
- Myoglobinuria 1 study
- Myoma 6 studies
- Myopathies, Nemaline 1 study
- Myopathies, Structural, Congenital 1 study
- Myopathy, myotubular 1 study
- Myopia 97 studies
- Myopia, Degenerative 3 studies
- Myopia, severe 9 studies
- Myositis 32 studies
- Myositis, Inclusion Body 7 studies
- Myotonia 4 studies
- Myotonia atrophica 15 studies
- Myotonia Congenita 2 studies
- Myotonic Disorders 9 studies
- Myotonic Dystrophy 15 studies
- Myxoid liposarcoma 1 study
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