function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Falniowski, Andrzej & Sarbu, Serban', 1],
    ['Glöer, Peter & Grego, Jozef', 6],
    ['Glöer, Peter & Pešić, Vladimir', 1],
    ['Grego, Jozef & Gloeer, Peter & Eross, Zoltan Peter', 12],
    ['Hofman, Sebastian & Grego, Jozef & Rysiewska, Aleksandra', 2],
    ['Marković, Vanja & Gojšina, Vukašin & Novaković, Boris', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=24)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);