function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bolotov, Ivan & Vikhrev, Ilya V. & Lopes-Lima, Manuel', 1],
    ['Dunker, W.', 1],
    ['Giacomino, Sebastián & Signorelli, Javier H.', 4],
    ['Gurumayum, S. D.', 1],
    ['Ivanova, Mariya B. & Tsurpalo, Alexandra P.', 1],
    ['Mariottini, Paolo & Smriglio, Carlo & Oliverio, Marco', 1],
    ['Ng, Ting Hui & Jeratthitikul, Ekgachai & Sutcharit, Chirasak', 1],
    ['Schumacher, Chrétien Fréderic', 2],
    ['Tasso, Vicente & El Haddad, Mustapha & Assadi, Carolina', 1],
    ['Yu, Yanan & Jiao, Yingyi & Zhang, Junlong', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);