function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ivanov, Martin', 4],
    ['Ivanov, Martin & Böhme, Madelaine', 1],
    ['Ivanov, Martin & Čerňanský, Andrej & Bonilla-Salomón, Isaac', 1],
    ['Myers, Charles W.', 1],
    ['Ren, Jin-Long & Wang, Kai & Nguyen, Tao Thien & Hoang, Chung Van', 1],
    ['Syromyatnikova, Elena & Tesakov, Alexey & Mayda, Serdar', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=9)',
    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);