Table 2.
Topic labelling
| Topic# | Frequent words | Topic labelling |
|---|---|---|
| 1 | Queueing; waiting; hospital; COVID-19; patient | Patients waiting time and COVID-19 |
| 2 | Rfid; big; data; cloud; computing | Industry 4.0 technologies |
| 3 | Sustainability; economic; sustainable; supply; chains | Sustainable operations and supply chain |
| 4 | Circular; reverse; economy; logistics; operations | Circular economy |
| 5 | Service; co-creation; system, value, network | Service-ecosystem |
| 6 | Knowledge; supply; information; healthcare; chain | Knowledge management |
| 7 | Behavioural; operations; supply; healthcare, chains | Behavioural OM/SCM |
| 8 | Risk; disruption; failure; resilience, readiness | Risk and resilience |
| 9 | Logistics; humanitarian; supply, healthcare; chains | Humanitarian logistics |
| 10 | Pharmaceutical; supply; healthcare; industry; chains | Pharmaceutical supply chains |
| 11 | Healthcare; change; climate; process; adaption | Climate change |
| 12 | Markov; model; healthcare; supply; process | Markov method |
| 13 | Logistics; service; chain; healthcare; operations | Healthcare logistics service |
| 14 | Simulation; model; operations; supply; chain | Simulation |
| 15 | Literature; systematic; reviews; healthcare; supply | Literature reviews |
| 16 | warehousing; storage; warehouse; modelling; study | Warehousing |
| 17 | Programming; mixed; integer; healthcare; operations | Mixed-integer programming |
| 18 | Stochastic; programming; model; method; chain | Stochastic programming |
| 19 | Queueing, model; process; healthcare; operations | Queueing model |
| 20 | Reengineering; bpr; process; healthcare; operations | Business process reengineering |
| 21 | Programming; Math; model; methods; operations | Mathematical programming |
| 22 | Structural; modelling; equation; supply; chain | Structural equation modelling |
| 23 | Empirical; survey; studies; case; healthcare | Empirical research in healthcare |
| 24 | healthcare; action; study; chains; supply | Action research |
| 25 | Outsourcing; source; offshore; supply; chains | Outsourcing |
| 26 | Heuristic; programming; methods; healthcare; study | Heuristic |
| 27 | Hierarchal; programming; linear; modelling; healthcare | Hierarchal linear programming |
| 28 | Modelling; multilevel; methodology; chains; healthcare | Multilevel modelling |
| 29 | Studies; longitudinal; method; healthcare; supply | Longitudinal studies |
| 30 | Game; theory; modelling; healthcare; study | Game theory modelling |
| 31 | Healthcare; multi; methods; studies; chains | Multi-methods/ Mixed-methods studies |
| 32 | Marketing; packaging; chains; study; service | Packaging |
| 33 | Strategy; operations; supply; healthcare; chain | Strategy |
| 34 | Programming; goal; model; healthcare; chains | Goal programming |