public function home()
 {
     $countDiseases = Disease::count();
     $countSymptom = Symptom::count();
     $countDiagnostic = Diagnostic::count();
     $lastRegistered = User::orderBy('created_at', 'desc')->take(9)->get();
     return view('admin.home')->with('countDiagnostic', $countDiagnostic)->with('countSymptom', $countSymptom)->with('countDiseases', $countDiseases)->with('lastRegistered', $lastRegistered);
 }