epidemiological study design:randomised, randomized, non randomised, non randomized, non-randomized, non-randomised, non blind, non blinded, non-blinded, non-blind, single, blind, blinded, double, triple, controlled, uncontrolled, placebo-controlled, cluster, therapeutic, crossover, cross-over, randomized clinical, randomised clinical, non-randomised clinical, non-randomized clinical, non randomized clinical, non randomised clinical,  multi-arm, post marketing, equivalence, phase ii, phase 2, phase 3, phase iii, inferiority, individually, two arm, two-arm, industrially sponsored, publicly sponsored, double-blinded, double-blind, triple-blinded, triple-blind,double blind, double blinded, simple blind, simple-blind, simple-blinded, simple blinded, triple blinded, triple blind, single-blind, single blind, single-blinded, single blinded, randomly assigned, qualitative, grounded theory, descriptive, ethnographic, ethnography, phenomenology, phenomenological, quantitative, quasi-experimental, quasi experimental, natural experiment, before after, interrupted time series, ecological, correlational, case control, case-control, case-controlled, case controlled, cross sectional, cross-sectional, serial, descriptive, prospective, retrospective, birth, case cohort, occupational, nested, crossover, cross-over, series, self-controlled, base, comparison, finding, case-only, case-report, case report, observational, multi-center, multi-centre, morbidity, multicentre, multicenter, historic, longitudinal, observer, hospital-based, lifecourse, patient cohort,experimental, observational, population, epidemiological, meta-analysis, meta-analyses, systematic, integrative, literature, systematic literature, integrative literature, systematic, quantitative evidence, qualitative evidence, synthesis, syntheses, qualitative evidence synthesis, qualitative evidence syntheses, quantitative evidence synthesis, quantitative evidence syntheses;

study synonyms: study, design, survey, trial, cohort, analysis, analyses, analysis, approach, methodology, research, review;

population sample noun: total, population, sample, number, study, cohort, consisted, comprising, consisting, comprised, group, dataset, sera, characteristics, features, records, analysis, analyses;

verb synonyms: include, included, explore, explored, perform, performed, compared, covering, cover, comparing, evaluating, covered, making, involving, comparing, performing, exploring, including, examining, selecting, conducting, studying, comprised, collecting, concerning, compare, made, evaluate, evaluated, involve, involved, examine, examined, select, selected, study, studied, conduct, conducted, comprising, collected, collect, concerned, concerns, comprised, were, is, are, was, derived, deriving, derive, developed, developing, develop;

population: children,schoolchildren, controls, patients, individuals, subjects, persons, females, males, elderly, adolescents, teens, teenagers, students, mothers, fathers, men, women, boys, girls, participants, adults, outpatients, employees, cases, users, trainees, offsprings, families, counterparts;

exposure related clue: risk factors, risk factor, risk variant, risk variants, variant, variants, indicator, indicators, factor, factors, marker, markers, contributory factor, contributory factors, independent factor, independent factors, independent variants, independent variant, predictor, predictors, independent predictor, independent predictors, contributor, contributors, protective factor, protective factors, variables, risk variables, independent variables, contributory variables

outcome related clue: characteristics, diagnosis, onset, risk, prevalence, incidence, aetiology, etiology, epidemiology, epidemic, perception, occurence, remission, pattern, severity

exposure-outcome association: relation, relations, association, associations, biology, role, relationship, relationships, influence, imbalance, impact, link, correlation, connection, interaction, interactions, effectiveness; 

covariate related clue: confounding factors,confounding variables,confounding variants,covariate factors,covariable factors,confounding variable,confounding variant,confounding factor,confounders,covariables,covariates,confounding,covariable,covariate,confounder,independent variables

effect size: hr, rr, or, aor, adjusted odds ratio, adjusted odds ratios, hazard ratios, hazard ratio, odds ratio, odds ratios, odd ratio, odd ratios, relative risk, adjusted relative risk, adjusted hazard ratio, adjusted hazard ratios, hazard rate ratio, hazard rate ratios;

epidemiological abstract structure: conclusion, conclusions, research methods, research approach, introduction, results, methods, approach, background, method, design, research design;

association adverbs: significantly, positively, rapidly, negatively, inversely, strongly, differentially, specifically, independently, similarly, controversially, substantially, linearly;

adjustment: adjustment, adjusting, adjusted, controlled, controlling, control, standarized, standarised; 

numbers: one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety, hundred, hundreds, thousand, thousands, million, millions