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    ngOnInit(): void {

        this.route.queryParams.subscribe(params => {

            const exam_request_id = params['id'];

        
        });
    }

<button *ngIf="state.can_site_visit" [routerLink]="['/msc-exam/site-visit/create']" [queryParams]="{ id: exam_request_id }" class="btn btn-primary btn-lg btn-block btn-huge">
                <i class="fa fa-building"></i> Create Site Visit</button>