function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Boucïek, Zdenek', 20],
    ['Gadallah, Neveen S.', 1],
    ['Jacobs, Hans-Joachim & Liebig, Wolf-Harald', 1],
    ['Jahantigh, Fatemeh & Rakhshani, Ehsan & Mokhtari, Azizollah', 9],
    ['Mokrousov, M. V. & Proshchalykin, M. Yu. & Aliyev, Kh. A.', 2],
    ['Mokrousov, Mikhail', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=37)',
    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);