function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cao, Liang-Ming & Achterberg, Cornelis Van & Tang, Yan-Long', 1],
    ['Ghahari, H. & Jussila, R.', 1],
    ['Hopkins, Tapani & Roininen, Heikki & Noort, Simon van', 2],
    ['Khalaim, A. I. & Ruíz-Cancino, E.', 3],
    ['Kolarov, J.', 1],
    ['Pook, Victoria G. & Sharkey, Michael J. & Wahl, David B.', 4],
    ['Rousse, Pascal & Noort, Simon Van', 2],
    ['Varga, A.', 1],
    ['Çoruh, S. & Özbek, H.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=16)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);