function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barkalov, A. V. & Mutin, V. A.', 1],
    ['Bächli, Gerhard & Merz, Bernhard & Haenni, Jean-Paul', 1],
    ['Heimburg, Helge & Doczkal, Dieter & Holzinger, Werner E.', 5],
    ['Kočić, Anja & Vujić, Ante & Tot, Tamara', 5],
    ['MAZáNEK, Libor & VONIČKA, Pavel & PREISLER, JiřÍ', 4],
    ['Mutin, V. A.', 2],
    ['Prokhorov, A. V. & Popov, G. V. & Shparyk, V. Yu.', 1],
    ['Schlüsslmayr, Gerhard', 1],
    ['Speight, Martin C. D. & Athanasiades, Anouk & Bessat, Marie', 1],
    ['Thompson, Christian', 1],
    ['Vockeroth J. R.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);