function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ataabadi, Majid Mirzaie & Mohammadalizadeh, Jafar', 1],
    ['Geraads, Denis & Spassov, Nikolaï & Hristova, Latinka', 2],
    ['Koufos, George D. & Sen, Sevket', 2],
    ['Koufos, George D. & Vlachou, Theodora D.', 3],
    ['Montoya, Plinio & Ginsburg, Léonard & Alberdi, María Teresa', 1],
    ['Tesakov, Alexey S. & Titov, Vadim V. & Simakova, Alexandra N.', 2],
    ['Zouhri, Samir & Moussa, Abelkhaleq Ben', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);