function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Anistratenko, V. V. & Furyk, Yu. I. & Anistratenko, O. Yu.', 2],
    ['Arabuli, Lela & Murvanidze, Lali & Faltynkova, Anna', 1],
    ['Atzner', 1],
    ['Breure, Abraham S. H. & Tardy, Emmanuel', 1],
    ['Frank, Christa', 2],
    ['Gloeer, Peter & Pesic, Vladimir', 2],
    ['Glöer, Peter & Bössneck, Ulrich', 1],
    ['Glöer, Peter & Hirschfelder, Hans-Jürgen', 2],
    ['Habe, Tadashige', 1],
    ['Harzhauser, Mathias & Neubauer, Thomas A. & Mandic, Oleg', 1],
    ['Marković, Vanja & Gojšina, Vukašin & Novaković, Boris', 2],
    ['Müller, Otto Friedrich', 3],
    ['Neubauer, Thomas A. & Harzhauser, Mathias', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);