function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Dubatolov, V. V. & Zinchenko, V. K.', 1],
    ['Heiss, Ernst & AndreasE & Lederwasch, Manfred & RomedU', 4],
    ['Kim, Junggon & Roca-Cusachs, Marcos & Jung, Sunghoon', 8],
    ['Souma, Jun & Sakai, Yoshiaki & Ishikawa, Tadashi', 5],
    ['Zhou, Yanyan & Rédei, Dávid', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);